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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 |
---|---|
2036 | /** |
2037 | * Filter the dbDelta SQL queries for inserting or updating. |
2038 | * |
2039 | * Queries filterable via this hook contain "INSERT INTO" or "UPDATE". |
2040 | * |
2041 | * @since 3.3.0 |
2042 | * |
2043 | * @param array $iqueries An array of dbDelta insert or update SQL queries. |
2044 | */ |
2045 | $iqueries = apply_filters( 'dbdelta_insert_queries', $iqueries ); |
2046 |
|
2047 | $global_tables = $wpdb->tables( 'global' ); |
2048 | foreach ( $cqueries as $table => $qry ) { |
2049 | // Upgrade global tables only for the main site. Don't upgrade at all if conditions are not optimal. |
2050 | if ( in_array( $table, $global_tables ) && ! wp_should_upgrade_global_tables() ) { |
2051 | unset( $cqueries[ $table ], $for_update[ $table ] ); |
2052 | continue; |
2053 | } |
2054 |
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