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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 |
|---|---|
| 2181 | if ( ! $q['suppress_filters'] ) { |
| 2182 | /** |
| 2183 | * Filters the search SQL that is used in the WHERE clause of WP_Query. |
| 2184 | * |
| 2185 | * @since 3.0.0 |
| 2186 | * |
| 2187 | * @param string $search Search SQL for WHERE clause. |
| 2188 | * @param WP_Query $query The current WP_Query object. |
| 2189 | */ |
| 2190 | $search = apply_filters_ref_array( 'posts_search', array( $search, &$this ) ); |
| 2191 | } |
| 2192 | |
| 2193 | // Taxonomies. |
| 2194 | if ( ! $this->is_singular ) { |
| 2195 | $this->parse_tax_query( $q ); |
| 2196 | |
| 2197 | $clauses = $this->tax_query->get_sql( $wpdb->posts, 'ID' ); |
| 2198 | |
| 2199 | $join .= $clauses['join']; |