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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 |
|---|---|
| 1467 | |
| 1468 | if ( in_array( $queries, array( '', 'all', 'blog', 'global', 'ms_global' ), true ) ) |
| 1469 | $queries = wp_get_db_schema( $queries ); |
| 1470 | |
| 1471 | // Separate individual queries into an array |
| 1472 | if ( !is_array($queries) ) { |
| 1473 | $queries = explode( ';', $queries ); |
| 1474 | $queries = array_filter( $queries ); |
| 1475 | } |
| 1476 | $queries = apply_filters( 'dbdelta_queries', $queries ); |
| 1477 | |
| 1478 | $cqueries = array(); // Creation Queries |
| 1479 | $iqueries = array(); // Insertion Queries |
| 1480 | $for_update = array(); |
| 1481 | |
| 1482 | // Create a tablename index for an array ($cqueries) of queries |
| 1483 | foreach($queries as $qry) { |
| 1484 | if (preg_match("|CREATE TABLE ([^ ]*)|", $qry, $matches)) { |
| 1485 | $cqueries[ trim( $matches[1], '`' ) ] = $qry; |