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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 |
|---|---|
| 351 | * @since 3.1.0 |
| 352 | * |
| 353 | * @param array $clauses Array containing the query's JOIN and WHERE clauses. |
| 354 | * @param array $queries Array of meta queries. |
| 355 | * @param string $type Type of meta. |
| 356 | * @param string $primary_table Primary table. |
| 357 | * @param string $primary_id_column Primary column ID. |
| 358 | * @param object $context The main query object. |
| 359 | */ |
| 360 | return apply_filters_ref_array( 'get_meta_sql', array( $sql, $this->queries, $type, $primary_table, $primary_id_column, $context ) ); |
| 361 | } |
| 362 | |
| 363 | /** |
| 364 | * Generate SQL clauses to be appended to a main query. |
| 365 | * |
| 366 | * Called by the public WP_Meta_Query::get_sql(), this method is abstracted |
| 367 | * out to maintain parity with the other Query classes. |
| 368 | * |
| 369 | * @since 4.1.0 |