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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 |
---|---|
2073 | if ( ! $q['suppress_filters'] ) { |
2074 | /** |
2075 | * Filters the search SQL that is used in the WHERE clause of WP_Query. |
2076 | * |
2077 | * @since 3.0.0 |
2078 | * |
2079 | * @param string $search Search SQL for WHERE clause. |
2080 | * @param WP_Query $this The current WP_Query object. |
2081 | */ |
2082 | $search = apply_filters_ref_array( 'posts_search', array( $search, &$this ) ); |
2083 | } |
2084 |
|
2085 | // Taxonomies |
2086 | if ( ! $this->is_singular ) { |
2087 | $this->parse_tax_query( $q ); |
2088 |
|
2089 | $clauses = $this->tax_query->get_sql( $wpdb->posts, 'ID' ); |
2090 |
|
2091 | $join .= $clauses['join']; |