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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 |
|---|---|
| 2191 | /** |
| 2192 | * Filters the dbDelta SQL queries for inserting or updating. |
| 2193 | * |
| 2194 | * Queries filterable via this hook contain "INSERT INTO" or "UPDATE". |
| 2195 | * |
| 2196 | * @since 3.3.0 |
| 2197 | * |
| 2198 | * @param array $iqueries An array of dbDelta insert or update SQL queries. |
| 2199 | */ |
| 2200 | $iqueries = apply_filters( 'dbdelta_insert_queries', $iqueries ); |
| 2201 | |
| 2202 | $text_fields = array( 'tinytext', 'text', 'mediumtext', 'longtext' ); |
| 2203 | $blob_fields = array( 'tinyblob', 'blob', 'mediumblob', 'longblob' ); |
| 2204 | |
| 2205 | $global_tables = $wpdb->tables( 'global' ); |
| 2206 | foreach ( $cqueries as $table => $qry ) { |
| 2207 | // Upgrade global tables only for the main site. Don't upgrade at all if conditions are not optimal. |
| 2208 | if ( in_array( $table, $global_tables ) && ! wp_should_upgrade_global_tables() ) { |
| 2209 | unset( $cqueries[ $table ], $for_update[ $table ] ); |