PDO::sqliteCreateFunction Registers a User Defined Function for use in SQL statements &reftitle.description; public boolPDO::sqliteCreateFunction stringfunction_name callablecallback intnum_args-1 intflags0 &warn.experimental.func; This method allows you to register a PHP function with SQLite as an UDF (User Defined Function), so that it can be called from within your SQL statements. The UDF can be used in any SQL statement that can call functions, such as SELECT and UPDATE statements and also in triggers. &reftitle.parameters; function_name The name of the function used in SQL statements. callback Callback function to handle the defined SQL function. Callback functions should return a type understood by SQLite (i.e. scalar type). This function need to be defined as: mixedcallback mixedvalue mixedvalues value The first argument passed to the SQL function. values Further arguments passed to the SQL function. num_args The number of arguments that the SQL function takes. If this parameter is -1, then the SQL function may take any number of arguments. flags A bitwise conjunction of flags. Currently, only PDO::SQLITE_DETERMINISTIC is supported, which specifies that the function always returns the same result given the same inputs within a single SQL statement. &reftitle.returnvalues; &return.success; &reftitle.changelog; &Version; &Description; 7.1.4 The flags parameter has been added. &reftitle.examples; sqliteCreateFunction('md5rev', 'md5_and_reverse', 1); $rows = $db->query('SELECT md5rev(filename) FROM files')->fetchAll(); ?> ]]> In this example, we have a function that calculates the md5 sum of a string, and then reverses it. When the SQL statement executes, it returns the value of the filename transformed by our function. The data returned in $rows contains the processed result. The beauty of this technique is that you do not need to process the result using a &foreach; loop after you have queried for the data. You can use and to override SQLite native SQL functions. &reftitle.seealso; sqlite_create_function sqlite_create_aggregate