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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 |
|---|---|
| 1539 | /** |
| 1540 | * Filter the terms query SQL clauses. |
| 1541 | * |
| 1542 | * @since 3.1.0 |
| 1543 | * |
| 1544 | * @param array $pieces Terms query SQL clauses. |
| 1545 | * @param string|array $taxonomies A taxonomy or array of taxonomies. |
| 1546 | * @param array $args An array of terms query arguments. |
| 1547 | */ |
| 1548 | $clauses = apply_filters( 'terms_clauses', compact( $pieces ), $taxonomies, $args ); |
| 1549 | $fields = isset( $clauses[ 'fields' ] ) ? $clauses[ 'fields' ] : ''; |
| 1550 | $join = isset( $clauses[ 'join' ] ) ? $clauses[ 'join' ] : ''; |
| 1551 | $where = isset( $clauses[ 'where' ] ) ? $clauses[ 'where' ] : ''; |
| 1552 | $orderby = isset( $clauses[ 'orderby' ] ) ? $clauses[ 'orderby' ] : ''; |
| 1553 | $order = isset( $clauses[ 'order' ] ) ? $clauses[ 'order' ] : ''; |
| 1554 | $limits = isset( $clauses[ 'limits' ] ) ? $clauses[ 'limits' ] : ''; |
| 1555 | |
| 1556 | $query = "SELECT $fields FROM $wpdb->terms AS t $join WHERE $where $orderby $order $limits"; |
| 1557 | |