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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 |
|---|---|
| 1830 | /** |
| 1831 | * Filter the dbDelta SQL queries for inserting or updating. |
| 1832 | * |
| 1833 | * Queries filterable via this hook contain "INSERT INTO" or "UPDATE". |
| 1834 | * |
| 1835 | * @since 3.3.0 |
| 1836 | * |
| 1837 | * @param array $iqueries An array of dbDelta insert or update SQL queries. |
| 1838 | */ |
| 1839 | $iqueries = apply_filters( 'dbdelta_insert_queries', $iqueries ); |
| 1840 | |
| 1841 | $global_tables = $wpdb->tables( 'global' ); |
| 1842 | foreach ( $cqueries as $table => $qry ) { |
| 1843 | // Upgrade global tables only for the main site. Don't upgrade at all if DO_NOT_UPGRADE_GLOBAL_TABLES is defined. |
| 1844 | if ( in_array( $table, $global_tables ) && ( !is_main_site() || defined( 'DO_NOT_UPGRADE_GLOBAL_TABLES' ) ) ) { |
| 1845 | unset( $cqueries[ $table ], $for_update[ $table ] ); |
| 1846 | continue; |
| 1847 | } |
| 1848 | |