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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 |
|---|---|
| 2392 | |
| 2393 | // Filter again for the benefit of caching plugins. Regular plugins should use the hooks above. |
| 2394 | if ( !$q['suppress_filters'] ) { |
| 2395 | $where = apply_filters_ref_array( 'posts_where_request', array( $where, &$this ) ); |
| 2396 | $groupby = apply_filters_ref_array( 'posts_groupby_request', array( $groupby, &$this ) ); |
| 2397 | $join = apply_filters_ref_array( 'posts_join_request', array( $join, &$this ) ); |
| 2398 | $orderby = apply_filters_ref_array( 'posts_orderby_request', array( $orderby, &$this ) ); |
| 2399 | $distinct = apply_filters_ref_array( 'posts_distinct_request', array( $distinct, &$this ) ); |
| 2400 | $fields = apply_filters_ref_array( 'posts_fields_request', array( $fields, &$this ) ); |
| 2401 | $limits = apply_filters_ref_array( 'post_limits_request', array( $limits, &$this ) ); |
| 2402 | } |
| 2403 | |
| 2404 | if ( ! empty($groupby) ) |
| 2405 | $groupby = 'GROUP BY ' . $groupby; |
| 2406 | if ( !empty( $orderby ) ) |
| 2407 | $orderby = 'ORDER BY ' . $orderby; |
| 2408 | $found_rows = ''; |
| 2409 | if ( !$q['no_found_rows'] && !empty($limits) ) |
| 2410 | $found_rows = 'SQL_CALC_FOUND_ROWS'; |