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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 |
|---|---|
| 2509 | |
| 2510 | $orderby = $q['orderby']; |
| 2511 | |
| 2512 | $pieces = array( 'where', 'groupby', 'join', 'orderby', 'distinct', 'fields', 'limits' ); |
| 2513 | |
| 2514 | // Apply post-paging filters on where and join. Only plugins that |
| 2515 | // manipulate paging queries should use these hooks. |
| 2516 | if ( !$q['suppress_filters'] ) { |
| 2517 | $where = apply_filters_ref_array( 'posts_where_paged', array( $where, &$this ) ); |
| 2518 | $groupby = apply_filters_ref_array( 'posts_groupby', array( $groupby, &$this ) ); |
| 2519 | $join = apply_filters_ref_array( 'posts_join_paged', array( $join, &$this ) ); |
| 2520 | $orderby = apply_filters_ref_array( 'posts_orderby', array( $orderby, &$this ) ); |
| 2521 | $distinct = apply_filters_ref_array( 'posts_distinct', array( $distinct, &$this ) ); |
| 2522 | $limits = apply_filters_ref_array( 'post_limits', array( $limits, &$this ) ); |
| 2523 | $fields = apply_filters_ref_array( 'posts_fields', array( $fields, &$this ) ); |
| 2524 | |
| 2525 | // Filter all clauses at once, for convenience |
| 2526 | $clauses = (array) apply_filters_ref_array( 'posts_clauses', array( compact( $pieces ), &$this ) ); |
| 2527 | foreach ( $pieces as $piece ) |