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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 |
---|---|
2752 | /** |
2753 | * Filters the dbDelta SQL queries for inserting or updating. |
2754 | * |
2755 | * Queries filterable via this hook contain "INSERT INTO" or "UPDATE". |
2756 | * |
2757 | * @since 3.3.0 |
2758 | * |
2759 | * @param string[] $iqueries An array of dbDelta insert or update SQL queries. |
2760 | */ |
2761 | $iqueries = apply_filters( 'dbdelta_insert_queries', $iqueries ); |
2762 |
|
2763 | $text_fields = array( 'tinytext', 'text', 'mediumtext', 'longtext' ); |
2764 | $blob_fields = array( 'tinyblob', 'blob', 'mediumblob', 'longblob' ); |
2765 |
|
2766 | $global_tables = $wpdb->tables( 'global' ); |
2767 | foreach ( $cqueries as $table => $qry ) { |
2768 | // Upgrade global tables only for the main site. Don't upgrade at all if conditions are not optimal. |
2769 | if ( in_array( $table, $global_tables, true ) && ! wp_should_upgrade_global_tables() ) { |
2770 | unset( $cqueries[ $table ], $for_update[ $table ] ); |