<?php
/**
* Comment API: WP_Comment_Query class
*
* @package WordPress
* @subpackage Comments
* @since 4.4.0
*/

/**
* Core class used for querying comments.
*
* @since 3.1.0
*
* @see WP_Comment_Query::__construct() for accepted arguments.
*/
#[AllowDynamicProperties]
class WP_Comment_Query {

/**
* SQL for database query.
*
* @since 4.0.1
* @var string
*/
public $request;

/**
* Metadata query container
*
* @since 3.5.0
* @var WP_Meta_Query A meta query instance.
*/
public $meta_query = false;

/**
* Metadata query clauses.
*
* @since 4.4.0
* @var array
*/
protected $meta_query_clauses;

/**
* SQL query clauses.
*
* @since 4.4.0
* @var array
*/
protected $sql_clauses = array(
'select' => '',
'from' => '',
'where' => array(),
'groupby' => '',
'orderby' => '',
'limits' => '',
);

/**
* SQL WHERE clause.
*
* Stored after the {@see 'comments_clauses'} filter is run on the compiled WHERE sub-clauses.
*
* @since 4.4.2
* @var string
*/
protected $filtered_where_clause;

/**
* Date query container
*
* @since 3.7.0
* @var WP_Date_Query A date query instance.
*/
public $date_query = false;

/**
* Query vars set by the user.
*
* @since 3.1.0
* @var array
*/
public $query_vars;

/**
* Default values for query vars.
*
* @since 4.2.0
* @var array
*/
public $query_var_defaults;

/**
* List of comments located by the query.
*
* @since 4.0.0
* @var int[]|WP_Comment[]
*/
public $comments;

/**
* The amount of found comments for the current query.
*
* @since 4.4.0
* @var int
*/
public $found_comments = 0;

/**
* The number of pages.
*
* @since 4.4.0
* @var int
*/
public $max_num_pages = 0;

/**
* Make private/protected methods readable for backward compatibility.
*
* @since 4.0.0
*
* @param string $name Method to call.
* @param array $arguments Arguments to pass when calling.
* @return mixed|false Return value of the callback, false otherwise.
*/
public function __call( $name, $arguments ) {
if ( 'get_search_sql' === $name ) {
return $this->get_search_sql( ...$arguments );
}
return false;
}

/**
* Constructor.
*
* Sets up the comment query, based on the query vars passed.
*
* @since 4.2.0
* @since 4.4.0 `$parent__in` and `$parent__not_in` were added.
* @since 4.4.0 Order by `comment__in` was added. `$update_comment_meta_cache`, `$no_found_rows`,
* `$hierarchical`, and `$update_comment_post_cache` were added.
* @since 4.5.0 Introduced the `$author_url` argument.
* @since 4.6.0 Introduced the `$cache_domain` argument.
* @since 4.9.0 Introduced the `$paged` argument.
* @since 5.1.0 Introduced the `$meta_compare_key` argument.
* @since 5.3.0 Introduced the `$meta_type_key` argument.
*
* @param string|array $query {
* Optional. Array or query string of comment query parameters. Default empty.
*
* @type string $author_email Comment author email address. Default empty.
* @type string $author_url Comment author URL. Default empty.
* @type int[] $author__in Array of author IDs to include comments for. Default empty.
* @type int[] $author__not_in Array of author IDs to exclude comments for. Default empty.
* @type int[] $comment__in Array of comment IDs to include. Default empty.
* @type int[] $comment__not_in Array of comment IDs to exclude. Default empty.
* @type bool $count Whether to return a comment count (true) or array of
* comment objects (false). Default false.
* @type array $date_query Date query clauses to limit comments by. See WP_Date_Query.
* Default null.
* @type string $fields Comment fields to return. Accepts 'ids' for comment IDs
* only or empty for all fields. Default empty.
* @type array $include_unapproved Array of IDs or email addresses of users whose unapproved
* comments will be returned by the query regardless of
* `$status`. Default empty.
* @type int $karma Karma score to retrieve matching comments for.
* Default empty.
* @type string|string[] $meta_key Meta key or keys to filter by.
* @type string|string[] $meta_value Meta value or values to filter by.
* @type string $meta_compare MySQL operator used for comparing the meta value.
* See WP_Meta_Query::__construct() for accepted values and default value.
* @type string $meta_compare_key MySQL operator used for comparing the meta key.
* See WP_Meta_Query::__construct() for accepted values and default value.
* @type string $meta_type MySQL data type that the meta_value column will be CAST to for comparisons.
* See WP_Meta_Query::__construct() for accepted values and default value.
* @type string $meta_type_key MySQL data type that the meta_key column will be CAST to for comparisons.
* See WP_Meta_Query::__construct() for accepted values and default value.
* @type array $meta_query An associative array of WP_Meta_Query arguments.
* See WP_Meta_Query::__construct() for accepted values.
* @type int $number Maximum number of comments to retrieve.
* Default empty (no limit).
* @type int $paged When used with `$number`, defines the page of results to return.
* When used with `$offset`, `$offset` takes precedence. Default 1.
* @type int $offset Number of comments to offset the query. Used to build
* LIMIT clause. Default 0.
* @type bool $no_found_rows Whether to disable the `SQL_CALC_FOUND_ROWS` query.
* Default: true.
* @type string|array $orderby Comment status or array of statuses. To use 'meta_value'
* or 'meta_value_num', `$meta_key` must also be defined.
* To sort by a specific `$meta_query` clause, use that
* clause's array key. Accepts:
* - 'comment_agent'
* - 'comment_approved'
* - 'comment_author'
* - 'comment_author_email'
* - 'comment_author_IP'
* - 'comment_author_url'
* - 'comment_content'
* - 'comment_date'
* - 'comment_date_gmt'
* - 'comment_ID'
* - 'comment_karma'
* - 'comment_parent'
* - 'comment_post_ID'
* - 'comment_type'
* - 'user_id'
* - 'comment__in'
* - 'meta_value'
* - 'meta_value_num'
* - The value of `$meta_key`
* - The array keys of `$meta_query`
* - false, an empty array, or 'none' to disable `ORDER BY` clause.
* Default: 'comment_date_gmt'.
* @type string $order How to order retrieved comments. Accepts 'ASC', 'DESC'.
* Default: 'DESC'.
* @type int $parent Parent ID of comment to retrieve children of.
* Default empty.
* @type int[] $parent__in Array of parent IDs of comments to retrieve children for.
* Default empty.
* @type int[] $parent__not_in Array of parent IDs of comments *not* to retrieve
* children for. Default empty.
* @type int[] $post_author__in Array of author IDs to retrieve comments for.
* Default empty.
* @type int[] $post_author__not_in Array of author IDs *not* to retrieve comments for.
* Default empty.
* @type int $post_id Limit results to those affiliated with a given post ID.
* Default 0.
* @type int[] $post__in Array of post IDs to include affiliated comments for.
* Default empty.
* @type int[] $post__not_in Array of post IDs to exclude affiliated comments for.
* Default empty.
* @type int $post_author Post author ID to limit results by. Default empty.
* @type string|string[] $post_status Post status or array of post statuses to retrieve
* affiliated comments for. Pass 'any' to match any value.
* Default empty.
* @type string|string[] $post_type Post type or array of post types to retrieve affiliated
* comments for. Pass 'any' to match any value. Default empty.
* @type string $post_name Post name to retrieve affiliated comments for.
* Default empty.
* @type int $post_parent Post parent ID to retrieve affiliated comments for.
* Default empty.
* @type string $search Search term(s) to retrieve matching comments for.
* Default empty.
* @type string|array $status Comment statuses to limit results by. Accepts an array
* or space/comma-separated list of 'hold' (`comment_status=0`),
* 'approve' (`comment_status=1`), 'all', or a custom
* comment status. Default 'all'.
* @type string|string[] $type Include comments of a given type, or array of types.
* Accepts 'comment', 'pings' (includes 'pingback' and
* 'trackback'), or any custom type string. Default empty.
* @type string[] $type__in Include comments from a given array of comment types.
* Default empty.
* @type string[] $type__not_in Exclude comments from a given array of comment types.
* Default empty.
* @type int $user_id Include comments for a specific user ID. Default empty.
* @type bool|string $hierarchical Whether to include comment descendants in the results.
* - 'threaded' returns a tree, with each comment's children
* stored in a `children` property on the `WP_Comment` object.
* - 'flat' returns a flat array of found comments plus
* their children.
* - Boolean `false` leaves out descendants.
* The parameter is ignored (forced to `false`) when
* `$fields` is 'ids' or 'counts'. Accepts 'threaded',
* 'flat', or false. Default: false.
* @type string $cache_domain Unique cache key to be produced when this query is stored in
* an object cache. Default is 'core'.
* @type bool $update_comment_meta_cache Whether to prime the metadata cache for found comments.
* Default true.
* @type bool $update_comment_post_cache Whether to prime the cache for comment posts.
* Default false.
* }
*/
public function __construct( $query = '' ) {
$this->query_var_defaults = array(
'author_email' => '',
'author_url' => '',
'author__in' => '',
'author__not_in' => '',
'include_unapproved' => '',
'fields' => '',
'ID' => '',
'comment__in' => '',
'comment__not_in' => '',
'karma' => '',
'number' => '',
'offset' => '',
'no_found_rows' => true,
'orderby' => '',
'order' => 'DESC',
'paged' => 1,
'parent' => '',
'parent__in' => '',
'parent__not_in' => '',
'post_author__in' => '',
'post_author__not_in' => '',
'post_ID' => '',
'post_id' => 0,
'post__in' => '',
'post__not_in' => '',
'post_author' => '',
'post_name' => '',
'post_parent' => '',
'post_status' => '',
'post_type' => '',
'status' => 'all',
'type' => '',
'type__in' => '',
'type__not_in' => '',
'user_id' => '',
'search' => '',
'count' => false,
'meta_key' => '',
'meta_value' => '',
'meta_query' => '',
'date_query' => null, // See WP_Date_Query.
'hierarchical' => false,
'cache_domain' => 'core',
'update_comment_meta_cache' => true,
'update_comment_post_cache' => false,
);

if ( ! empty( $query ) ) {
$this->query( $query );
}
}

/**
* Parse arguments passed to the comment query with default query parameters.
*
* @since 4.2.0 Extracted from WP_Comment_Query::query().
*
* @param string|array $query WP_Comment_Query arguments. See WP_Comment_Query::__construct() for accepted arguments.
*/
public function parse_query( $query = '' ) {
if ( empty( $query ) ) {
$query = $this->query_vars;
}

$this->query_vars = wp_parse_args( $query, $this->query_var_defaults );

/**
* Fires after the comment query vars have been parsed.
*
* @since 4.2.0
*
* @param WP_Comment_Query $query The WP_Comment_Query instance (passed by reference).
*/
do_action_ref_array( 'parse_comment_query', array( &$this ) );
}

/**
* Sets up the WordPress query for retrieving comments.
*
* @since 3.1.0
* @since 4.1.0 Introduced 'comment__in', 'comment__not_in', 'post_author__in',
* 'post_author__not_in', 'author__in', 'author__not_in', 'post__in',
* 'post__not_in', 'include_unapproved', 'type__in', and 'type__not_in'
* arguments to $query_vars.
* @since 4.2.0 Moved parsing to WP_Comment_Query::parse_query().
*
* @param string|array $query Array or URL query string of parameters.
* @return array|int List of comments, or number of comments when 'count' is passed as a query var.
*/
public function query( $query ) {
$this->query_vars = wp_parse_args( $query );
return $this->get_comments();
}

/**
* Get a list of comments matching the query vars.
*
* @since 4.2.0
*
* @global wpdb $wpdb WordPress database abstraction object.
*
* @return int|int[]|WP_Comment[] List of comments or number of found comments if `$count` argument is true.
*/
public function get_comments() {
global $wpdb;

$this->parse_query();

// Parse meta query.
$this->meta_query = new WP_Meta_Query();
$this->meta_query->parse_query_vars( $this->query_vars );

/**
* Fires before comments are retrieved.
*
* @since 3.1.0
*
* @param WP_Comment_Query $query Current instance of WP_Comment_Query (passed by reference).
*/
do_action_ref_array( 'pre_get_comments', array( &$this ) );

// Reparse query vars, in case they were modified in a 'pre_get_comments' callback.
$this->meta_query->parse_query_vars( $this->query_vars );
if ( ! empty( $this->meta_query->queries ) ) {
$this->meta_query_clauses = $this->meta_query->get_sql( 'comment', $wpdb->comments, 'comment_ID', $this );
}

$comment_data = null;

/**
* Filters the comments data before the query takes place.
*
* Return a non-null value to bypass WordPress' default comment queries.
*
* The expected return type from this filter depends on the value passed
* in the request query vars:
* - When `$this->query_vars['count']` is set, the filter should return
* the comment count as an integer.
* - When `'ids' === $this->query_vars['fields']`, the filter should return
* an array of comment IDs.
* - Otherwise the filter should return an array of WP_Comment objects.
*
* Note that if the filter returns an array of comment data, it will be assigned
* to the `comments` property of the current WP_Comment_Query instance.
*
* Filtering functions that require pagination information are encouraged to set
* the `found_comments` and `max_num_pages` properties of the WP_Comment_Query object,
* passed to the filter by reference. If WP_Comment_Query does not perform a database
* query, it will not have enough information to generate these values itself.
*
* @since 5.3.0
* @since 5.6.0 The returned array of comment data is assigned to the `comments` property
* of the current WP_Comment_Query instance.
*
* @param array|int|null $comment_data Return an array of comment data to short-circuit WP's comment query,
* the comment count as an integer if `$this->query_vars['count']` is set,
* or null to allow WP to run its normal queries.
* @param WP_Comment_Query $query The WP_Comment_Query instance, passed by reference.
*/
$comment_data = apply_filters_ref_array( 'comments_pre_query', array( $comment_data, &$this ) );

if ( null !== $comment_data ) {
if ( is_array( $comment_data ) && ! $this->query_vars['count'] ) {
$this->comments = $comment_data;
}

return $comment_data;
}

/*
* Only use the args defined in the query_var_defaults to compute the key,
* but ignore 'fields', 'update_comment_meta_cache', 'update_comment_post_cache' which does not affect query results.
*/
$_args = wp_array_slice_assoc( $this->query_vars, array_keys( $this->query_var_defaults ) );
unset( $_args['fields'], $_args['update_comment_meta_cache'], $_args['update_comment_post_cache'] );

$key = md5( serialize( $_args ) );
$last_changed = wp_cache_get_last_changed( 'comment' );

$cache_key = "get_comments:$key:$last_changed";
$cache_value = wp_cache_get( $cache_key, 'comment-queries' );
if ( false === $cache_value ) {
$comment_ids = $this->get_comment_ids();
if ( $comment_ids ) {
$this->set_found_comments();
}

$cache_value = array(
'comment_ids' => $comment_ids,
'found_comments' => $this->found_comments,
);
wp_cache_add( $cache_key, $cache_value, 'comment-queries' );
} else {
$comment_ids = $cache_value['comment_ids'];
$this->found_comments = $cache_value['found_comments'];
}

if ( $this->found_comments && $this->query_vars['number'] ) {
$this->max_num_pages = (int) ceil( $this->found_comments / $this->query_vars['number'] );
}

// If querying for a count only, there's nothing more to do.
if ( $this->query_vars['count'] ) {
// $comment_ids is actually a count in this case.
return (int) $comment_ids;
}

$comment_ids = array_map( 'intval', $comment_ids );

if ( $this->query_vars['update_comment_meta_cache'] ) {
wp_lazyload_comment_meta( $comment_ids );
}

if ( 'ids' === $this->query_vars['fields'] ) {
$this->comments = $comment_ids;
return $this->comments;
}

_prime_comment_caches( $comment_ids, false );

// Fetch full comment objects from the primed cache.
$_comments = array();
foreach ( $comment_ids as $comment_id ) {
$_comment = get_comment( $comment_id );
if ( $_comment ) {
$_comments[] = $_comment;
}
}

// Prime comment post caches.
if ( $this->query_vars['update_comment_post_cache'] ) {
$comment_post_ids = array();
foreach ( $_comments as $_comment ) {
$comment_post_ids[] = $_comment->comment_post_ID;
}

_prime_post_caches( $comment_post_ids, false, false );
}

/**
* Filters the comment query results.
*
* @since 3.1.0
*
* @param WP_Comment[] $_comments An array of comments.
* @param WP_Comment_Query $query Current instance of WP_Comment_Query (passed by reference).
*/
$_comments = apply_filters_ref_array( 'the_comments', array( $_comments, &$this ) );

// Convert to WP_Comment instances.
$comments = array_map( 'get_comment', $_comments );

if ( $this->query_vars['hierarchical'] ) {
$comments = $this->fill_descendants( $comments );
}

$this->comments = $comments;
return $this->comments;
}

/**
* Used internally to get a list of comment IDs matching the query vars.
*
* @since 4.4.0
*
* @global wpdb $wpdb WordPress database abstraction object.
*
* @return int|array A single count of comment IDs if a count query. An array of comment IDs if a full query.
*/
protected function get_comment_ids() {
global $wpdb;

// Assemble clauses related to 'comment_approved'.
$approved_clauses = array();

// 'status' accepts an array or a comma-separated string.
$status_clauses = array();
$statuses = wp_parse_list( $this->query_vars['status'] );

// Empty 'status' should be interpreted as 'all'.
if ( empty( $statuses ) ) {
$statuses = array( 'all' );
}

// 'any' overrides other statuses.
if ( ! in_array( 'any', $statuses, true ) ) {
foreach ( $statuses as $status ) {
switch ( $status ) {
case 'hold':
$status_clauses[] = "comment_approved = '0'";
break;

case 'approve':
$status_clauses[] = "comment_approved = '1'";
break;

case 'all':
case '':
$status_clauses[] = "( comment_approved = '0' OR comment_approved = '1' )";
break;

default:
$status_clauses[] = $wpdb->prepare( 'comment_approved = %s', $status );
break;
}
}

if ( ! empty( $status_clauses ) ) {
$approved_clauses[] = '( ' . implode( ' OR ', $status_clauses ) . ' )';
}
}

// User IDs or emails whose unapproved comments are included, regardless of $status.
if ( ! empty( $this->query_vars['include_unapproved'] ) ) {
$include_unapproved = wp_parse_list( $this->query_vars['include_unapproved'] );

foreach ( $include_unapproved as $unapproved_identifier ) {
// Numeric values are assumed to be user IDs.
if ( is_numeric( $unapproved_identifier ) ) {
$approved_clauses[] = $wpdb->prepare( "( user_id = %d AND comment_approved = '0' )", $unapproved_identifier );
} else {
// Otherwise we match against email addresses.
if ( ! empty( $_GET['unapproved'] ) && ! empty( $_GET['moderation-hash'] ) ) {
// Only include requested comment.
$approved_clauses[] = $wpdb->prepare( "( comment_author_email = %s AND comment_approved = '0' AND {$wpdb->comments}.comment_ID = %d )", $unapproved_identifier, (int) $_GET['unapproved'] );
} else {
// Include all of the author's unapproved comments.
$approved_clauses[] = $wpdb->prepare( "( comment_author_email = %s AND comment_approved = '0' )", $unapproved_identifier );
}
}
}
}

// Collapse comment_approved clauses into a single OR-separated clause.
if ( ! empty( $approved_clauses ) ) {
if ( 1 === count( $approved_clauses ) ) {
$this->sql_clauses['where']['approved'] = $approved_clauses[0];
} else {
$this->sql_clauses['where']['approved'] = '( ' . implode( ' OR ', $approved_clauses ) . ' )';
}
}

$order = ( 'ASC' === strtoupper( $this->query_vars['order'] ) ) ? 'ASC' : 'DESC';

// Disable ORDER BY with 'none', an empty array, or boolean false.
if ( in_array( $this->query_vars['orderby'], array( 'none', array(), false ), true ) ) {
$orderby = '';
} elseif ( ! empty( $this->query_vars['orderby'] ) ) {
$ordersby = is_array( $this->query_vars['orderby'] ) ?
$this->query_vars['orderby'] :
preg_split( '/[,\s]/', $this->query_vars['orderby'] );

$orderby_array = array();
$found_orderby_comment_id = false;
foreach ( $ordersby as $_key => $_value ) {
if ( ! $_value ) {
continue;
}

if ( is_int( $_key ) ) {
$_orderby = $_value;
$_order = $order;
} else {
$_orderby = $_key;
$_order = $_value;
}

if ( ! $found_orderby_comment_id && in_array( $_orderby, array( 'comment_ID', 'comment__in' ), true ) ) {
$found_orderby_comment_id = true;
}

$parsed = $this->parse_orderby( $_orderby );

if ( ! $parsed ) {
continue;
}

if ( 'comment__in' === $_orderby ) {
$orderby_array[] = $parsed;
continue;
}

$orderby_array[] = $parsed . ' ' . $this->parse_order( $_order );
}

// If no valid clauses were found, order by comment_date_gmt.
if ( empty( $orderby_array ) ) {
$orderby_array[] = "$wpdb->comments.comment_date_gmt $order";
}

// To ensure determinate sorting, always include a comment_ID clause.
if ( ! $found_orderby_comment_id ) {
$comment_id_order = '';

// Inherit order from comment_date or comment_date_gmt, if available.
foreach ( $orderby_array as $orderby_clause ) {
if ( preg_match( '/comment_date(?:_gmt)*\ (ASC|DESC)/', $orderby_clause, $match ) ) {
$comment_id_order = $match[1];
break;
}
}

// If no date-related order is available, use the date from the first available clause.
if ( ! $comment_id_order ) {
foreach ( $orderby_array as $orderby_clause ) {
if ( str_contains( 'ASC', $orderby_clause ) ) {
$comment_id_order = 'ASC';
} else {
$comment_id_order = 'DESC';
}

break;
}
}

// Default to DESC.
if ( ! $comment_id_order ) {
$comment_id_order = 'DESC';
}

$orderby_array[] = "$wpdb->comments.comment_ID $comment_id_order";
}

$orderby = implode( ', ', $orderby_array );
} else {
$orderby = "$wpdb->comments.comment_date_gmt $order";
}

$number = absint( $this->query_vars['number'] );
$offset = absint( $this->query_vars['offset'] );
$paged = absint( $this->query_vars['paged'] );
$limits = '';

if ( ! empty( $number ) ) {
if ( $offset ) {
$limits = 'LIMIT ' . $offset . ',' . $number;
} else {
$limits = 'LIMIT ' . ( $number * ( $paged - 1 ) ) . ',' . $number;
}
}

if ( $this->query_vars['count'] ) {
$fields = 'COUNT(*)';
} else {
$fields = "$wpdb->comments.comment_ID";
}

$post_id = absint( $this->query_vars['post_id'] );
if ( ! empty( $post_id ) ) {
$this->sql_clauses['where']['post_id'] = $wpdb->prepare( 'comment_post_ID = %d', $post_id );
}

// Parse comment IDs for an IN clause.
if ( ! empty( $this->query_vars['comment__in'] ) ) {
$this->sql_clauses['where']['comment__in'] = "$wpdb->comments.comment_ID IN ( " . implode( ',', wp_parse_id_list( $this->query_vars['comment__in'] ) ) . ' )';
}

// Parse comment IDs for a NOT IN clause.
if ( ! empty( $this->query_vars['comment__not_in'] ) ) {
$this->sql_clauses['where']['comment__not_in'] = "$wpdb->comments.comment_ID NOT IN ( " . implode( ',', wp_parse_id_list( $this->query_vars['comment__not_in'] ) ) . ' )';
}

// Parse comment parent IDs for an IN clause.
if ( ! empty( $this->query_vars['parent__in'] ) ) {
$this->sql_clauses['where']['parent__in'] = 'comment_parent IN ( ' . implode( ',', wp_parse_id_list( $this->query_vars['parent__in'] ) ) . ' )';
}

// Parse comment parent IDs for a NOT IN clause.
if ( ! empty( $this->query_vars['parent__not_in'] ) ) {
$this->sql_clauses['where']['parent__not_in'] = 'comment_parent NOT IN ( ' . implode( ',', wp_parse_id_list( $this->query_vars['parent__not_in'] ) ) . ' )';
}

// Parse comment post IDs for an IN clause.
if ( ! empty( $this->query_vars['post__in'] ) ) {
$this->sql_clauses['where']['post__in'] = 'comment_post_ID IN ( ' . implode( ',', wp_parse_id_list( $this->query_vars['post__in'] ) ) . ' )';
}

// Parse comment post IDs for a NOT IN clause.
if ( ! empty( $this->query_vars['post__not_in'] ) ) {
$this->sql_clauses['where']['post__not_in'] = 'comment_post_ID NOT IN ( ' . implode( ',', wp_parse_id_list( $this->query_vars['post__not_in'] ) ) . ' )';
}

if ( '' !== $this->query_vars['author_email'] ) {
$this->sql_clauses['where']['author_email'] = $wpdb->prepare( 'comment_author_email = %s', $this->query_vars['author_email'] );
}

if ( '' !== $this->query_vars['author_url'] ) {
$this->sql_clauses['where']['author_url'] = $wpdb->prepare( 'comment_author_url = %s', $this->query_vars['author_url'] );
}

if ( '' !== $this->query_vars['karma'] ) {
$this->sql_clauses['where']['karma'] = $wpdb->prepare( 'comment_karma = %d', $this->query_vars['karma'] );
}

// Filtering by comment_type: 'type', 'type__in', 'type__not_in'.
$raw_types = array(
'IN' => array_merge( (array) $this->query_vars['type'], (array) $this->query_vars['type__in'] ),
'NOT IN' => (array) $this->query_vars['type__not_in'],
);

$comment_types = array();
foreach ( $raw_types as $operator => $_raw_types ) {
$_raw_types = array_unique( $_raw_types );

foreach ( $_raw_types as $type ) {
switch ( $type ) {
// An empty translates to 'all', for backward compatibility.
case '':
case 'all':
break;

case 'comment':
case 'comments':
$comment_types[ $operator ][] = "''";
$comment_types[ $operator ][] = "'comment'";
break;

case 'pings':
$comment_types[ $operator ][] = "'pingback'";
$comment_types[ $operator ][] = "'trackback'";
break;

default:
$comment_types[ $operator ][] = $wpdb->prepare( '%s', $type );
break;
}
}

if ( ! empty( $comment_types[ $operator ] ) ) {
$types_sql = implode( ', ', $comment_types[ $operator ] );
$this->sql_clauses['where'][ 'comment_type__' . strtolower( str_replace( ' ', '_', $operator ) ) ] = "comment_type $operator ($types_sql)";
}
}

$parent = $this->query_vars['parent'];
if ( $this->query_vars['hierarchical'] && ! $parent ) {
$parent = 0;
}

if ( '' !== $parent ) {
$this->sql_clauses['where']['parent'] = $wpdb->prepare( 'comment_parent = %d', $parent );
}

if ( is_array( $this->query_vars['user_id'] ) ) {
$this->sql_clauses['where']['user_id'] = 'user_id IN (' . implode( ',', array_map( 'absint', $this->query_vars['user_id'] ) ) . ')';
} elseif ( '' !== $this->query_vars['user_id'] ) {
$this->sql_clauses['where']['user_id'] = $wpdb->prepare( 'user_id = %d', $this->query_vars['user_id'] );
}

// Falsey search strings are ignored.
if ( isset( $this->query_vars['search'] ) && strlen( $this->query_vars['search'] ) ) {
$search_sql = $this->get_search_sql(
$this->query_vars['search'],
array( 'comment_author', 'comment_author_email', 'comment_author_url', 'comment_author_IP', 'comment_content' )
);

// Strip leading 'AND'.
$this->sql_clauses['where']['search'] = preg_replace( '/^\s*AND\s*/', '', $search_sql );
}

// If any post-related query vars are passed, join the posts table.
$join_posts_table = false;
$plucked = wp_array_slice_assoc( $this->query_vars, array( 'post_author', 'post_name', 'post_parent' ) );
$post_fields = array_filter( $plucked );

if ( ! empty( $post_fields ) ) {
$join_posts_table = true;
foreach ( $post_fields as $field_name => $field_value ) {
// $field_value may be an array.
$esses = array_fill( 0, count( (array) $field_value ), '%s' );

// phpcs:ignore WordPress.DB.PreparedSQLPlaceholders.UnfinishedPrepare
$this->sql_clauses['where'][ $field_name ] = $wpdb->prepare( " {$wpdb->posts}.{$field_name} IN (" . implode( ',', $esses ) . ')', $field_value );
}
}

// 'post_status' and 'post_type' are handled separately, due to the specialized behavior of 'any'.
foreach ( array( 'post_status', 'post_type' ) as $field_name ) {
$q_values = array();
if ( ! empty( $this->query_vars[ $field_name ] ) ) {
$q_values = $this->query_vars[ $field_name ];
if ( ! is_array( $q_values ) ) {
$q_values = explode( ',', $q_values );
}

// 'any' will cause the query var to be ignored.
if ( in_array( 'any', $q_values, true ) || empty( $q_values ) ) {
continue;
}

$join_posts_table = true;

$esses = array_fill( 0, count( $q_values ), '%s' );

// phpcs:ignore WordPress.DB.PreparedSQLPlaceholders.UnfinishedPrepare
$this->sql_clauses['where'][ $field_name ] = $wpdb->prepare( " {$wpdb->posts}.{$field_name} IN (" . implode( ',', $esses ) . ')', $q_values );
}
}

// Comment author IDs for an IN clause.
if ( ! empty( $this->query_vars['author__in'] ) ) {
$this->sql_clauses['where']['author__in'] = 'user_id IN ( ' . implode( ',', wp_parse_id_list( $this->query_vars['author__in'] ) ) . ' )';
}

// Comment author IDs for a NOT IN clause.
if ( ! empty( $this->query_vars['author__not_in'] ) ) {
$this->sql_clauses['where']['author__not_in'] = 'user_id NOT IN ( ' . implode( ',', wp_parse_id_list( $this->query_vars['author__not_in'] ) ) . ' )';
}

// Post author IDs for an IN clause.
if ( ! empty( $this->query_vars['post_author__in'] ) ) {
$join_posts_table = true;
$this->sql_clauses['where']['post_author__in'] = 'post_author IN ( ' . implode( ',', wp_parse_id_list( $this->query_vars['post_author__in'] ) ) . ' )';
}

// Post author IDs for a NOT IN clause.
if ( ! empty( $this->query_vars['post_author__not_in'] ) ) {
$join_posts_table = true;
$this->sql_clauses['where']['post_author__not_in'] = 'post_author NOT IN ( ' . implode( ',', wp_parse_id_list( $this->query_vars['post_author__not_in'] ) ) . ' )';
}

$join = '';
$groupby = '';

if ( $join_posts_table ) {
$join .= "JOIN $wpdb->posts ON $wpdb->posts.ID = $wpdb->comments.comment_post_ID";
}

if ( ! empty( $this->meta_query_clauses ) ) {
$join .= $this->meta_query_clauses['join'];

// Strip leading 'AND'.
$this->sql_clauses['where']['meta_query'] = preg_replace( '/^\s*AND\s*/', '', $this->meta_query_clauses['where'] );

if ( ! $this->query_vars['count'] ) {
$groupby = "{$wpdb->comments}.comment_ID";
}
}

if ( ! empty( $this->query_vars['date_query'] ) && is_array( $this->query_vars['date_query'] ) ) {
$this->date_query = new WP_Date_Query( $this->query_vars['date_query'], 'comment_date' );

// Strip leading 'AND'.
$this->sql_clauses['where']['date_query'] = preg_replace( '/^\s*AND\s*/', '', $this->date_query->get_sql() );
}

$where = implode( ' AND ', $this->sql_clauses['where'] );

$pieces = array( 'fields', 'join', 'where', 'orderby', 'limits', 'groupby' );

/**
* Filters the comment query clauses.
*
* @since 3.1.0
*
* @param string[] $clauses {
* Associative array of the clauses for the query.
*
* @type string $fields The SELECT clause of the query.
* @type string $join The JOIN clause of the query.
* @type string $where The WHERE clause of the query.
* @type string $orderby The ORDER BY clause of the query.
* @type string $limits The LIMIT clause of the query.
* @type string $groupby The GROUP BY clause of the query.
* }
* @param WP_Comment_Query $query Current instance of WP_Comment_Query (passed by reference).
*/
$clauses = apply_filters_ref_array( 'comments_clauses', array( compact( $pieces ), &$this ) );

$fields = isset( $clauses['fields'] ) ? $clauses['fields'] : '';
$join = isset( $clauses['join'] ) ? $clauses['join'] : '';
$where = isset( $clauses['where'] ) ? $clauses['where'] : '';
$orderby = isset( $clauses['orderby'] ) ? $clauses['orderby'] : '';
$limits = isset( $clauses['limits'] ) ? $clauses['limits'] : '';
$groupby = isset( $clauses['groupby'] ) ? $clauses['groupby'] : '';

$this->filtered_where_clause = $where;

if ( $where ) {
$where = 'WHERE ' . $where;
}

if ( $groupby ) {
$groupby = 'GROUP BY ' . $groupby;
}

if ( $orderby ) {
$orderby = "ORDER BY $orderby";
}

$found_rows = '';
if ( ! $this->query_vars['no_found_rows'] ) {
$found_rows = 'SQL_CALC_FOUND_ROWS';
}

$this->sql_clauses['select'] = "SELECT $found_rows $fields";
$this->sql_clauses['from'] = "FROM $wpdb->comments $join";
$this->sql_clauses['groupby'] = $groupby;
$this->sql_clauses['orderby'] = $orderby;
$this->sql_clauses['limits'] = $limits;

// Beginning of the string is on a new line to prevent leading whitespace. See https://core.trac.wordpress.org/ticket/56841.
$this->request =
"{$this->sql_clauses['select']}
{$this->sql_clauses['from']}
{$where}
{$this->sql_clauses['groupby']}
{$this->sql_clauses['orderby']}
{$this->sql_clauses['limits']}";

if ( $this->query_vars['count'] ) {
return (int) $wpdb->get_var( $this->request );
} else {
$comment_ids = $wpdb->get_col( $this->request );
return array_map( 'intval', $comment_ids );
}
}

/**
* Populates found_comments and max_num_pages properties for the current
* query if the limit clause was used.
*
* @since 4.6.0
*
* @global wpdb $wpdb WordPress database abstraction object.
*/
private function set_found_comments() {
global $wpdb;

if ( $this->query_vars['number'] && ! $this->query_vars['no_found_rows'] ) {
/**
* Filters the query used to retrieve found comment count.
*
* @since 4.4.0
*
* @param string $found_comments_query SQL query. Default 'SELECT FOUND_ROWS()'.
* @param WP_Comment_Query $comment_query The `WP_Comment_Query` instance.
*/
$found_comments_query = apply_filters( 'found_comments_query', 'SELECT FOUND_ROWS()', $this );

$this->found_comments = (int) $wpdb->get_var( $found_comments_query );
}
}

/**
* Fetch descendants for located comments.
*
* Instead of calling `get_children()` separately on each child comment, we do a single set of queries to fetch
* the descendant trees for all matched top-level comments.
*
* @since 4.4.0
*
* @param WP_Comment[] $comments Array of top-level comments whose descendants should be filled in.
* @return array
*/
protected function fill_descendants( $comments ) {
$levels = array(
0 => wp_list_pluck( $comments, 'comment_ID' ),
);

$key = md5( serialize( wp_array_slice_assoc( $this->query_vars, array_keys( $this->query_var_defaults ) ) ) );
$last_changed = wp_cache_get_last_changed( 'comment' );

// Fetch an entire level of the descendant tree at a time.
$level = 0;
$exclude_keys = array( 'parent', 'parent__in', 'parent__not_in' );
do {
// Parent-child relationships may be cached. Only query for those that are not.
$child_ids = array();
$uncached_parent_ids = array();
$_parent_ids = $levels[ $level ];
if ( $_parent_ids ) {
$cache_keys = array();
foreach ( $_parent_ids as $parent_id ) {
$cache_keys[ $parent_id ] = "get_comment_child_ids:$parent_id:$key:$last_changed";
}
$cache_data = wp_cache_get_multiple( array_values( $cache_keys ), 'comment-queries' );
foreach ( $_parent_ids as $parent_id ) {
$parent_child_ids = $cache_data[ $cache_keys[ $parent_id ] ];
if ( false !== $parent_child_ids ) {
$child_ids = array_merge( $child_ids, $parent_child_ids );
} else {
$uncached_parent_ids[] = $parent_id;
}
}
}

if ( $uncached_parent_ids ) {
// Fetch this level of comments.
$parent_query_args = $this->query_vars;
foreach ( $exclude_keys as $exclude_key ) {
$parent_query_args[ $exclude_key ] = '';
}
$parent_query_args['parent__in'] = $uncached_parent_ids;
$parent_query_args['no_found_rows'] = true;
$parent_query_args['hierarchical'] = false;
$parent_query_args['offset'] = 0;
$parent_query_args['number'] = 0;

$level_comments = get_comments( $parent_query_args );

// Cache parent-child relationships.
$parent_map = array_fill_keys( $uncached_parent_ids, array() );
foreach ( $level_comments as $level_comment ) {
$parent_map[ $level_comment->comment_parent ][] = $level_comment->comment_ID;
$child_ids[] = $level_comment->comment_ID;
}

$data = array();
foreach ( $parent_map as $parent_id => $children ) {
$cache_key = "get_comment_child_ids:$parent_id:$key:$last_changed";
$data[ $cache_key ] = $children;
}
wp_cache_set_multiple( $data, 'comment-queries' );
}

++$level;
$levels[ $level ] = $child_ids;
} while ( $child_ids );

// Prime comment caches for non-top-level comments.
$descendant_ids = array();
for ( $i = 1, $c = count( $levels ); $i < $c; $i++ ) {
$descendant_ids = array_merge( $descendant_ids, $levels[ $i ] );
}

_prime_comment_caches( $descendant_ids, $this->query_vars['update_comment_meta_cache'] );

// Assemble a flat array of all comments + descendants.
$all_comments = $comments;
foreach ( $descendant_ids as $descendant_id ) {
$all_comments[] = get_comment( $descendant_id );
}

// If a threaded representation was requested, build the tree.
if ( 'threaded' === $this->query_vars['hierarchical'] ) {
$threaded_comments = array();
$ref = array();
foreach ( $all_comments as $k => $c ) {
$_c = get_comment( $c->comment_ID );

// If the comment isn't in the reference array, it goes in the top level of the thread.
if ( ! isset( $ref[ $c->comment_parent ] ) ) {
$threaded_comments[ $_c->comment_ID ] = $_c;
$ref[ $_c->comment_ID ] = $threaded_comments[ $_c->comment_ID ];

// Otherwise, set it as a child of its parent.
} else {

$ref[ $_c->comment_parent ]->add_child( $_c );
$ref[ $_c->comment_ID ] = $ref[ $_c->comment_parent ]->get_child( $_c->comment_ID );
}
}

// Set the 'populated_children' flag, to ensure additional database queries aren't run.
foreach ( $ref as $_ref ) {
$_ref->populated_children( true );
}

$comments = $threaded_comments;
} else {
$comments = $all_comments;
}

return $comments;
}

/**
* Used internally to generate an SQL string for searching across multiple columns.
*
* @since 3.1.0
*
* @global wpdb $wpdb WordPress database abstraction object.
*
* @param string $search Search string.
* @param string[] $columns Array of columns to search.
* @return string Search SQL.
*/
protected function get_search_sql( $search, $columns ) {
global $wpdb;

$like = '%' . $wpdb->esc_like( $search ) . '%';

$searches = array();
foreach ( $columns as $column ) {
$searches[] = $wpdb->prepare( "$column LIKE %s", $like );
}

return ' AND (' . implode( ' OR ', $searches ) . ')';
}

/**
* Parse and sanitize 'orderby' keys passed to the comment query.
*
* @since 4.2.0
*
* @global wpdb $wpdb WordPress database abstraction object.
*
* @param string $orderby Alias for the field to order by.
* @return string|false Value to used in the ORDER clause. False otherwise.
*/
protected function parse_orderby( $orderby ) {
global $wpdb;

$allowed_keys = array(
'comment_agent',
'comment_approved',
'comment_author',
'comment_author_email',
'comment_author_IP',
'comment_author_url',
'comment_content',
'comment_date',
'comment_date_gmt',
'comment_ID',
'comment_karma',
'comment_parent',
'comment_post_ID',
'comment_type',
'user_id',
);

if ( ! empty( $this->query_vars['meta_key'] ) ) {
$allowed_keys[] = $this->query_vars['meta_key'];
$allowed_keys[] = 'meta_value';
$allowed_keys[] = 'meta_value_num';
}

$meta_query_clauses = $this->meta_query->get_clauses();
if ( $meta_query_clauses ) {
$allowed_keys = array_merge( $allowed_keys, array_keys( $meta_query_clauses ) );
}

$parsed = false;
if ( $this->query_vars['meta_key'] === $orderby || 'meta_value' === $orderby ) {
$parsed = "$wpdb->commentmeta.meta_value";
} elseif ( 'meta_value_num' === $orderby ) {
$parsed = "$wpdb->commentmeta.meta_value+0";
} elseif ( 'comment__in' === $orderby ) {
$comment__in = implode( ',', array_map( 'absint', $this->query_vars['comment__in'] ) );
$parsed = "FIELD( {$wpdb->comments}.comment_ID, $comment__in )";
} elseif ( in_array( $orderby, $allowed_keys, true ) ) {

if ( isset( $meta_query_clauses[ $orderby ] ) ) {
$meta_clause = $meta_query_clauses[ $orderby ];
$parsed = sprintf( 'CAST(%s.meta_value AS %s)', esc_sql( $meta_clause['alias'] ), esc_sql( $meta_clause['cast'] ) );
} else {
$parsed = "$wpdb->comments.$orderby";
}
}

return $parsed;
}

/**
* Parse an 'order' query variable and cast it to ASC or DESC as necessary.
*
* @since 4.2.0
*
* @param string $order The 'order' query variable.
* @return string The sanitized 'order' query variable.
*/
protected function parse_order( $order ) {
if ( ! is_string( $order ) || empty( $order ) ) {
return 'DESC';
}

if ( 'ASC' === strtoupper( $order ) ) {
return 'ASC';
} else {
return 'DESC';
}
}
}