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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 |
|---|---|
| 211 | |
| 212 | /** |
| 213 | * Filter the date query WHERE clause. |
| 214 | * |
| 215 | * @since 3.7.0 |
| 216 | * |
| 217 | * @param string $where WHERE clause of the date query. |
| 218 | * @param WP_Date_Query $this The WP_Date_Query instance. |
| 219 | */ |
| 220 | return apply_filters( 'get_date_sql', $where, $this ); |
| 221 | } |
| 222 | |
| 223 | /** |
| 224 | * Turns a single date subquery into pieces for a WHERE clause. |
| 225 | * |
| 226 | * @since 3.7.0 |
| 227 | * return array |
| 228 | */ |
| 229 | protected function get_sql_for_subquery( $query ) { |