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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 |
|---|---|
| 447 | $pieces = array( 'fields', 'join', 'where', 'orderby', 'order', 'limits', 'groupby' ); |
| 448 | /** |
| 449 | * Filter the comment query clauses. |
| 450 | * |
| 451 | * @since 3.1.0 |
| 452 | * |
| 453 | * @param array $pieces A compacted array of comment query clauses. |
| 454 | * @param WP_Comment_Query &$this Current instance of WP_Comment_Query, passed by reference. |
| 455 | */ |
| 456 | $clauses = apply_filters_ref_array( 'comments_clauses', array( compact( $pieces ), &$this ) ); |
| 457 | |
| 458 | $fields = isset( $clauses[ 'fields' ] ) ? $clauses[ 'fields' ] : ''; |
| 459 | $join = isset( $clauses[ 'join' ] ) ? $clauses[ 'join' ] : ''; |
| 460 | $where = isset( $clauses[ 'where' ] ) ? $clauses[ 'where' ] : ''; |
| 461 | $orderby = isset( $clauses[ 'orderby' ] ) ? $clauses[ 'orderby' ] : ''; |
| 462 | $order = isset( $clauses[ 'order' ] ) ? $clauses[ 'order' ] : ''; |
| 463 | $limits = isset( $clauses[ 'limits' ] ) ? $clauses[ 'limits' ] : ''; |
| 464 | $groupby = isset( $clauses[ 'groupby' ] ) ? $clauses[ 'groupby' ] : ''; |
| 465 | |