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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 |
|---|---|
| 1551 | array_unshift($cqueries, $qry); |
| 1552 | } else if (preg_match("|INSERT INTO ([^ ]*)|", $qry, $matches)) { |
| 1553 | $iqueries[] = $qry; |
| 1554 | } else if (preg_match("|UPDATE ([^ ]*)|", $qry, $matches)) { |
| 1555 | $iqueries[] = $qry; |
| 1556 | } else { |
| 1557 | // Unrecognized query type |
| 1558 | } |
| 1559 | } |
| 1560 | $cqueries = apply_filters( 'dbdelta_create_queries', $cqueries ); |
| 1561 | $iqueries = apply_filters( 'dbdelta_insert_queries', $iqueries ); |
| 1562 | |
| 1563 | $global_tables = $wpdb->tables( 'global' ); |
| 1564 | foreach ( $cqueries as $table => $qry ) { |
| 1565 | // Upgrade global tables only for the main site. Don't upgrade at all if DO_NOT_UPGRADE_GLOBAL_TABLES is defined. |
| 1566 | if ( in_array( $table, $global_tables ) && ( !is_main_site() || defined( 'DO_NOT_UPGRADE_GLOBAL_TABLES' ) ) ) { |
| 1567 | unset( $cqueries[ $table ], $for_update[ $table ] ); |
| 1568 | continue; |
| 1569 | } |