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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 |
|---|---|
| 1209 | * |
| 1210 | * @type array $clauses Array containing the query's JOIN and WHERE clauses. |
| 1211 | * @type array $queries Array of meta queries. |
| 1212 | * @type string $type Type of meta. |
| 1213 | * @type string $primary_table Primary table. |
| 1214 | * @type string $primary_id_column Primary column ID. |
| 1215 | * @type object $context The main query object. |
| 1216 | * } |
| 1217 | */ |
| 1218 | return apply_filters_ref_array( 'get_meta_sql', array( $sql, $this->queries, $type, $primary_table, $primary_id_column, $context ) ); |
| 1219 | } |
| 1220 | |
| 1221 | /** |
| 1222 | * Generate SQL clauses to be appended to a main query. |
| 1223 | * |
| 1224 | * Called by the public {@see WP_Meta_Query::get_sql()}, this method |
| 1225 | * is abstracted out to maintain parity with the other Query classes. |
| 1226 | * |
| 1227 | * @since 4.1.0 |