very-very simple way to wite file in PHP

writeDataTofile.php

function writeDataTofile($data=null) {
	$upload_path = APP . 'tmp' . DS . 'logs' . DS . 'trace.log';
	$fp = fopen($upload_path,'w');
	if (is_array($data)) {
		foreach ($data as $key=>$value) {
			fwrite($fp, $key . ": " . $value . "\n\r");
		}
	} else {
		fwrite($fp, $key . ": " . $value . "\n\r");
	}
	fclose($fp);
}