Kennt Ihr dieses Login System welches File basierend ist?

function changePassword($user,$pass1,$pass2){
	$errorText = '';  
	
	// Check passwords
	if ($pass1 != $pass2) $errorText = "Passwords are not identical!";  
	elseif (strlen($pass1) < 6) $errorText = "Password is to short!";  
	
	// Read all user into Array
	$aUsers = array();
	$pfile = fopen("userpwd.txt","a+");  
	rewind($pfile);
	while (!feof($pfile)) {
		$line = fgets($pfile);
		$tmp = explode(':', $line);  
		$aUsers[$tmp[0]] = $tmp[1];
	}
  	fclose($pfile);
	
	// Test if user exists
	if( array_key_exists($user,$aUsers) )
		// then change password
		$aUsers[$user] = md5($pass1)
	else
		// otherwise make error
		$errorText = 'User NOT found, password NOT changed !';  
	
	// Store data into file if okay
	if( $errorText == '' )  
	{
		// w+ = auf dateianfang und datei leeren
		$pfile = fopen("userpwd.txt","w+");  
		foreach( $aUsers as $sUser=>$sPass )
			fwrite($pfile, "\r\n$sUser:$sPass");  
		fclose($pfile);
	}
	
	return $errorText;
}