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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 |
---|---|
1599 | /** |
1600 | * Filter the dbDelta SQL queries for inserting or updating. |
1601 | * |
1602 | * Queries filterable via this hook contain "INSERT INTO" or "UPDATE". |
1603 | * |
1604 | * @since 3.3.0 |
1605 | * |
1606 | * @param array $iqueries An array of dbDelta insert or update SQL queries. |
1607 | */ |
1608 | $iqueries = apply_filters( 'dbdelta_insert_queries', $iqueries ); |
1609 |
|
1610 | $global_tables = $wpdb->tables( 'global' ); |
1611 | foreach ( $cqueries as $table => $qry ) { |
1612 | // Upgrade global tables only for the main site. Don't upgrade at all if DO_NOT_UPGRADE_GLOBAL_TABLES is defined. |
1613 | if ( in_array( $table, $global_tables ) && ( !is_main_site() || defined( 'DO_NOT_UPGRADE_GLOBAL_TABLES' ) ) ) { |
1614 | unset( $cqueries[ $table ], $for_update[ $table ] ); |
1615 | continue; |
1616 | } |
1617 |
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