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<title>[27207] trunk/src/wp-includes/query.php: Inline documentation for various SQL clause hooks in wp-includes/query.php.</title>
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<dt>Revision</dt> <dd><a href="http://core.trac.wordpress.org/changeset/27207">27207</a></dd>
<dt>Author</dt> <dd>DrewAPicture</dd>
<dt>Date</dt> <dd>2014-02-20 17:40:14 +0000 (Thu, 20 Feb 2014)</dd>
</dl>
<h3>Log Message</h3>
<pre>Inline documentation for various SQL clause hooks in wp-includes/query.php.
Covers documentation for SQL clause hooks specified for use by caching plugins, including:
* `posts_selection`
* `posts_where_request`
* `posts_groupby_request`
* `posts_join_request`
* `posts_orderby_request`
* `posts_distinct_request`
* `posts_fields_request`
* `post_limits_request`
* `posts_clauses_request`
Props dougwollison, DrewAPicture.
See <a href="http://core.trac.wordpress.org/ticket/25514">#25514</a>.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpincludesqueryphp">trunk/src/wp-includes/query.php</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunksrcwpincludesqueryphp"></a>
<div class="modfile"><h4>Modified: trunk/src/wp-includes/query.php (27206 => 27207)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/src/wp-includes/query.php 2014-02-20 17:33:16 UTC (rev 27206)
+++ trunk/src/wp-includes/query.php 2014-02-20 17:40:14 UTC (rev 27207)
</span><span class="lines">@@ -2972,20 +2972,119 @@
</span><span class="cx"> }
</span><span class="cx"> }
</span><span class="cx">
</span><del>- // Announce current selection parameters. For use by caching plugins.
</del><ins>+ /**
+ * Fires to announce the query's current selection parameters.
+ *
+ * For use by caching plugins.
+ *
+ * @since 2.3.0
+ *
+ * @param string $selection The assembled selection query.
+ */
</ins><span class="cx"> do_action( 'posts_selection', $where . $groupby . $orderby . $limits . $join );
</span><span class="cx">
</span><del>- // Filter again for the benefit of caching plugins. Regular plugins should use the hooks above.
</del><ins>+ /*
+ * Filter again for the benefit of caching plugins.
+ * Regular plugins should use the hooks above.
+ */
</ins><span class="cx"> if ( !$q['suppress_filters'] ) {
</span><ins>+ /**
+ * Filter the WHERE clause of the query.
+ *
+ * For use by caching plugins.
+ *
+ * @since 2.5.0
+ *
+ * @param string $where The WHERE clause of the query.
+ * @param WP_Query &$this The WP_Query instance (passed by reference).
+ */
</ins><span class="cx"> $where = apply_filters_ref_array( 'posts_where_request', array( $where, &$this ) );
</span><ins>+
+ /**
+ * Filter the GROUP BY clause of the query.
+ *
+ * For use by caching plugins.
+ *
+ * @since 2.5.0
+ *
+ * @param string $groupby The GROUP BY clause of the query.
+ * @param WP_Query &$this The WP_Query instance (passed by reference).
+ */
</ins><span class="cx"> $groupby = apply_filters_ref_array( 'posts_groupby_request', array( $groupby, &$this ) );
</span><ins>+
+ /**
+ * Filter the JOIN clause of the query.
+ *
+ * For use by caching plugins.
+ *
+ * @since 2.5.0
+ *
+ * @param string $join The JOIN clause of the query.
+ * @param WP_Query &$this The WP_Query instance (passed by reference).
+ */
</ins><span class="cx"> $join = apply_filters_ref_array( 'posts_join_request', array( $join, &$this ) );
</span><ins>+
+ /**
+ * Filter the ORDER BY clause of the query.
+ *
+ * For use by caching plugins.
+ *
+ * @since 2.5.0
+ *
+ * @param string $orderby The ORDER BY clause of the query.
+ * @param WP_Query &$this The WP_Query instance (passed by reference).
+ */
</ins><span class="cx"> $orderby = apply_filters_ref_array( 'posts_orderby_request', array( $orderby, &$this ) );
</span><ins>+
+ /**
+ * Filter the DISTINCT clause of the query.
+ *
+ * For use by caching plugins.
+ *
+ * @since 2.5.0
+ *
+ * @param string $distinct The DISTINCT clause of the query.
+ * @param WP_Query &$this The WP_Query instance (passed by reference).
+ */
</ins><span class="cx"> $distinct = apply_filters_ref_array( 'posts_distinct_request', array( $distinct, &$this ) );
</span><ins>+
+ /**
+ * Filter the SELECT clause of the query.
+ *
+ * For use by caching plugins.
+ *
+ * @since 2.5.0
+ *
+ * @param string $fields The SELECT clause of the query.
+ * @param WP_Query &$this The WP_Query instance (passed by reference).
+ */
</ins><span class="cx"> $fields = apply_filters_ref_array( 'posts_fields_request', array( $fields, &$this ) );
</span><ins>+
+ /**
+ * Filter the LIMIT clause of the query.
+ *
+ * For use by caching plugins.
+ *
+ * @since 2.5.0
+ *
+ * @param string $limits The LIMIT clause of the query.
+ * @param WP_Query &$this The WP_Query instance (passed by reference).
+ */
</ins><span class="cx"> $limits = apply_filters_ref_array( 'post_limits_request', array( $limits, &$this ) );
</span><span class="cx">
</span><del>- // Filter all clauses at once, for convenience
</del><ins>+ /**
+ * Filter all query clauses at once, for convenience.
+ *
+ * For use by caching plugins.
+ *
+ * Covers the WHERE, GROUP BY, JOIN, ORDER BY, DISTINCT,
+ * fields (SELECT), and LIMITS clauses.
+ *
+ * @since 3.1.0
+ *
+ * @param array $pieces The pieces of the query.
+ * @param WP_Query &$this The WP_Query instance (passed by reference).
+ */
</ins><span class="cx"> $clauses = (array) apply_filters_ref_array( 'posts_clauses_request', array( compact( $pieces ), &$this ) );
</span><span class="cx"> foreach ( $pieces as $piece )
</span><span class="cx"> $$piece = isset( $clauses[ $piece ] ) ? $clauses[ $piece ] : '';
</span></span></pre>
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