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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 |
|---|---|
| 3046 | * |
| 3047 | * Covers the WHERE, GROUP BY, JOIN, ORDER BY, DISTINCT, |
| 3048 | * fields (SELECT), and LIMITS clauses. |
| 3049 | * |
| 3050 | * @since 3.1.0 |
| 3051 | * |
| 3052 | * @param array $clauses The list of clauses for the query. |
| 3053 | * @param WP_Query &$this The WP_Query instance (passed by reference). |
| 3054 | */ |
| 3055 | $clauses = (array) apply_filters_ref_array( 'posts_clauses', array( compact( $pieces ), &$this ) ); |
| 3056 | |
| 3057 | foreach ( $pieces as $piece ) { |
| 3058 | $$piece = isset( $clauses[ $piece ] ) ? $clauses[ $piece ] : ''; |
| 3059 | } |
| 3060 | } |
| 3061 | |
| 3062 | /** |
| 3063 | * Fires to announce the query's current selection parameters. |
| 3064 | * |