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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 |
|---|---|
| 1413 | /** |
| 1414 | * Filter the terms query SQL clauses. |
| 1415 | * |
| 1416 | * @since 3.1.0 |
| 1417 | * |
| 1418 | * @param array $pieces Terms query SQL clauses. |
| 1419 | * @param array $taxonomies An array of taxonomies. |
| 1420 | * @param array $args An array of terms query arguments. |
| 1421 | */ |
| 1422 | $clauses = apply_filters( 'terms_clauses', compact( $pieces ), $taxonomies, $args ); |
| 1423 | |
| 1424 | $fields = isset( $clauses[ 'fields' ] ) ? $clauses[ 'fields' ] : ''; |
| 1425 | $join = isset( $clauses[ 'join' ] ) ? $clauses[ 'join' ] : ''; |
| 1426 | $where = isset( $clauses[ 'where' ] ) ? $clauses[ 'where' ] : ''; |
| 1427 | $orderby = isset( $clauses[ 'orderby' ] ) ? $clauses[ 'orderby' ] : ''; |
| 1428 | $order = isset( $clauses[ 'order' ] ) ? $clauses[ 'order' ] : ''; |
| 1429 | $limits = isset( $clauses[ 'limits' ] ) ? $clauses[ 'limits' ] : ''; |
| 1430 | |
| 1431 | $query = "SELECT $fields FROM $wpdb->terms AS t $join WHERE $where $orderby $order $limits"; |