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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 |
|---|---|
| 1453 | |
| 1454 | if ( in_array( $queries, array( '', 'all', 'blog', 'global', 'ms_global' ), true ) ) |
| 1455 | $queries = wp_get_db_schema( $queries ); |
| 1456 | |
| 1457 | // Separate individual queries into an array |
| 1458 | if ( !is_array($queries) ) { |
| 1459 | $queries = explode( ';', $queries ); |
| 1460 | if ('' == $queries[count($queries) - 1]) array_pop($queries); |
| 1461 | } |
| 1462 | $queries = apply_filters( 'dbdelta_queries', $queries ); |
| 1463 | |
| 1464 | $cqueries = array(); // Creation Queries |
| 1465 | $iqueries = array(); // Insertion Queries |
| 1466 | $for_update = array(); |
| 1467 | |
| 1468 | // Create a tablename index for an array ($cqueries) of queries |
| 1469 | foreach($queries as $qry) { |
| 1470 | if (preg_match("|CREATE TABLE ([^ ]*)|", $qry, $matches)) { |
| 1471 | $cqueries[trim( strtolower($matches[1]), '`' )] = $qry; |