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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 |
|---|---|
| 436 | } |
| 437 | |
| 438 | // @todo Temporary hack to support empty values. Do not use outside of core. |
| 439 | if ( '_wp_zero_value' == $meta_value ) |
| 440 | $meta_value = 0; |
| 441 | |
| 442 | $where .= $wpdb->prepare( " AND CAST($alias.meta_value AS {$meta_type}) {$meta_compare} {$meta_compare_string}", $meta_value ); |
| 443 | } |
| 444 | |
| 445 | return apply_filters_ref_array( 'get_meta_sql', array( compact( 'join', 'where' ), $meta_query, $meta_type, $primary_table, $primary_id_column, &$context ) ); |
| 446 | } |
| 447 | |
| 448 | /** |
| 449 | * Populates the $meta_query property |
| 450 | * |
| 451 | * @access private |
| 452 | * @since 3.1.0 |
| 453 | * |
| 454 | * @param array $qv The query variables |