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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 |
|---|---|
| 549 | if ( empty( $where ) ) |
| 550 | $where = ''; |
| 551 | else |
| 552 | $where = ' AND (' . implode( "\n{$this->relation} ", $where ) . ' )'; |
| 553 | |
| 554 | $join = implode( "\n", $join ); |
| 555 | if ( ! empty( $join ) ) |
| 556 | $join = ' ' . $join; |
| 557 | |
| 558 | return apply_filters_ref_array( 'get_meta_sql', array( compact( 'join', 'where' ), $this->queries, $type, $primary_table, $primary_id_column, $context ) ); |
| 559 | } |
| 560 | } |
| 561 | |
| 562 | /** |
| 563 | * Retrieve the name of the metadata table for the specified object type. |
| 564 | * |
| 565 | * @since 2.9.0 |
| 566 | * @uses $wpdb WordPress database object for queries. |
| 567 | * |