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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 |
---|---|
2771 | /** |
2772 | * Filters the dbDelta SQL queries for inserting or updating. |
2773 | * |
2774 | * Queries filterable via this hook contain "INSERT INTO" or "UPDATE". |
2775 | * |
2776 | * @since 3.3.0 |
2777 | * |
2778 | * @param string[] $iqueries An array of dbDelta insert or update SQL queries. |
2779 | */ |
2780 | $iqueries = apply_filters( 'dbdelta_insert_queries', $iqueries ); |
2781 |
|
2782 | $text_fields = array( 'tinytext', 'text', 'mediumtext', 'longtext' ); |
2783 | $blob_fields = array( 'tinyblob', 'blob', 'mediumblob', 'longblob' ); |
2784 |
|
2785 | $global_tables = $wpdb->tables( 'global' ); |
2786 | foreach ( $cqueries as $table => $qry ) { |
2787 | // Upgrade global tables only for the main site. Don't upgrade at all if conditions are not optimal. |
2788 | if ( in_array( $table, $global_tables, true ) && ! wp_should_upgrade_global_tables() ) { |
2789 | unset( $cqueries[ $table ], $for_update[ $table ] ); |