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Inline documentation for various SQL clause hooks in wp-includes/query.php.

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Covers documentation for general SQL clause hooks, including:
* `posts_where`
* `posts_join`
* `posts_where_paged`
* `posts_groupby`
* `posts_join_paged`
* `posts_orderby`
* `posts_distinct`
* `post_limits`
* `posts_fields`
* `posts_clauses`

Props dougwollison, DrewAPicture.
See #25514.


Built from https://develop.svn.wordpress.org/trunk@27206


git-svn-id: http://core.svn.wordpress.org/trunk@27063 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
Drew Jaynes 2014-02-20 17:34:14 +00:00
parent 20398546a0
commit 742c77fc6f
1 changed files with 108 additions and 9 deletions
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117
wp-includes/query.php
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@ -2759,7 +2759,7 @@ class WP_Query {
$where_status = implode( ' OR ', $statuswheres );
if ( ! empty( $where_status ) ) {
$where .= " AND ($where_status)";
}
}
} elseif ( !$this->is_singular ) {
$where .= " AND ($wpdb->posts.post_status = 'publish'";
@ -2794,11 +2794,30 @@ class WP_Query {
$where .= $clauses['where'];
}
// Apply filters on where and join prior to paging so that any
// manipulations to them are reflected in the paging by day queries.
/*
* Apply filters on where and join prior to paging so that any
* manipulations to them are reflected in the paging by day queries.
*/
if ( !$q['suppress_filters'] ) {
$where = apply_filters_ref_array('posts_where', array( $where, &$this ) );
$join = apply_filters_ref_array('posts_join', array( $join, &$this ) );
/**
* Filter the WHERE clause of the query.
*
* @since 1.5.0
*
* @param string $where The WHERE clause of the query.
* @param WP_Query &$this The WP_Query instance (passed by reference).
*/
$where = apply_filters_ref_array( 'posts_where', array( $where, &$this ) );
/**
* Filter the JOIN clause of the query.
*
* @since 1.5.0
*
* @param string $where The JOIN clause of the query.
* @param WP_Query &$this The WP_Query instance (passed by reference).
*/
$join = apply_filters_ref_array( 'posts_join', array( $join, &$this ) );
}
// Paging
@ -2856,21 +2875,101 @@ class WP_Query {
$pieces = array( 'where', 'groupby', 'join', 'orderby', 'distinct', 'fields', 'limits' );
// Apply post-paging filters on where and join. Only plugins that
// manipulate paging queries should use these hooks.
/*
* Apply post-paging filters on where and join. Only plugins that
* manipulate paging queries should use these hooks.
*/
if ( !$q['suppress_filters'] ) {
/**
* Filter the WHERE clause of the query.
*
* Specifically for manipulating paging queries.
*
* @since 1.5.0
*
* @param string $where The WHERE clause of the query.
* @param WP_Query &$this The WP_Query instance (passed by reference).
*/
$where = apply_filters_ref_array( 'posts_where_paged', array( $where, &$this ) );
/**
* Filter the GROUP BY clause of the query.
*
* @since 2.0.0
*
* @param string $groupby The GROUP BY clause of the query.
* @param WP_Query &$this The WP_Query instance (passed by reference).
*/
$groupby = apply_filters_ref_array( 'posts_groupby', array( $groupby, &$this ) );
/**
* Filter the JOIN clause of the query.
*
* Specifically for manipulating paging queries.
*
* @since 1.5.0
*
* @param string $join The JOIN clause of the query.
* @param WP_Query &$this The WP_Query instance (passed by reference).
*/
$join = apply_filters_ref_array( 'posts_join_paged', array( $join, &$this ) );
/**
* Filter the ORDER BY clause of the query.
*
* @since 1.5.1
*
* @param string $orderby The ORDER BY clause of the query.
* @param WP_Query &$this The WP_Query instance (passed by reference).
*/
$orderby = apply_filters_ref_array( 'posts_orderby', array( $orderby, &$this ) );
/**
* Filter the DISTINCT clause of the query.
*
* @since 2.1.0
*
* @param string $distinct The DISTINCT clause of the query.
* @param WP_Query &$this The WP_Query instance (passed by reference).
*/
$distinct = apply_filters_ref_array( 'posts_distinct', array( $distinct, &$this ) );
/**
* Filter the LIMIT clause of the query.
*
* @since 2.1.0
*
* @param string $limits The LIMIT clause of the query.
* @param WP_Query &$this The WP_Query instance (passed by reference).
*/
$limits = apply_filters_ref_array( 'post_limits', array( $limits, &$this ) );
/**
* Filter the SELECT clause of the query.
*
* @since 2.1.0
*
* @param string $fields The SELECT clause of the query.
* @param WP_Query &$this The WP_Query instance (passed by reference).
*/
$fields = apply_filters_ref_array( 'posts_fields', array( $fields, &$this ) );
// Filter all clauses at once, for convenience
/**
* Filter all query clauses at once, for convenience.
*
* Covers the WHERE, GROUP BY, JOIN, ORDER BY, DISTINCT,
* fields (SELECT), and LIMITS clauses.
*
* @since 3.1.0
*
* @param array $clauses The list of clauses for the query.
* @param WP_Query &$this The WP_Query instance (passed by reference).
*/
$clauses = (array) apply_filters_ref_array( 'posts_clauses', array( compact( $pieces ), &$this ) );
foreach ( $pieces as $piece )
foreach ( $pieces as $piece ) {
$$piece = isset( $clauses[ $piece ] ) ? $clauses[ $piece ] : '';
}
}
// Announce current selection parameters. For use by caching plugins.