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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 3166 | * |
| 3167 | * Covers the WHERE, GROUP BY, JOIN, ORDER BY, DISTINCT, |
| 3168 | * fields (SELECT), and LIMITS clauses. |
| 3169 | * |
| 3170 | * @since 3.1.0 |
| 3171 | * |
| 3172 | * @param array $pieces The pieces of the query. |
| 3173 | * @param WP_Query &$this The WP_Query instance (passed by reference). |
| 3174 | */ |
| 3175 | $clauses = (array) apply_filters_ref_array( 'posts_clauses_request', array( compact( $pieces ), &$this ) ); |
| 3176 | foreach ( $pieces as $piece ) |
| 3177 | $$piece = isset( $clauses[ $piece ] ) ? $clauses[ $piece ] : ''; |
| 3178 | } |
| 3179 | |
| 3180 | if ( ! empty($groupby) ) |
| 3181 | $groupby = 'GROUP BY ' . $groupby; |
| 3182 | if ( !empty( $orderby ) ) |
| 3183 | $orderby = 'ORDER BY ' . $orderby; |
| 3184 | |