[php] driver_options in PDO.prepare optional (#8623)

* driver_options in PDO.prepare optional

* input_parameters is also optional

std/php/db/PDO.hx

@@ -100,7 +100,7 @@ extern class PDO {
 	function getAttribute(attribute:Int):Dynamic;
 	function getAvailableDrivers():NativeArray;
 	function lastInsertId(?name:String):String;
-	function prepare(statement:String, driver_options:NativeArray):PDOStatement;
+	function prepare(statement:String, ?driver_options:NativeArray):PDOStatement;
 	function query(statement:String, ?mode:Int):PDOStatement;
 	function quote(String:String, ?parameter_type:Int = 2):String;
 	function rollBack():Bool;

std/php/db/PDOStatement.hx

@@ -34,7 +34,7 @@ extern class PDOStatement {
 	function debugDumpParams():Bool;
 	function errorCode():String;
 	function errorInfo():NativeArray;
-	function execute(input_parameters:NativeArray):Bool;
+	function execute(?input_parameters:NativeArray):Bool;
 	function fetch(?fetch_style:Int = 4, ?cursor_orientation:Int = 0, ?cursor_offset:Int = 0):Dynamic;
 	function fetchAll(?fetch_style:Int, ?fetch_argument:Dynamic, ?ctor_args:NativeArray):NativeArray;
 	function fetchColumn(?column_number:Int = 0):String;