reverse Chinese characters per line

reverse.php

#!/usr/local/php/bin/php
<?php

function cstrrev($str)
{
  $len = strlen($str);
	for($i = 0; $i < $len; $i++)
	{
		$char = $str{0};
		if(ord($char) > 127)
		{
			$i++;
			if($i < $len)
			{
				$arr[] = substr($str, 0, 2);
				$str = substr($str, 2);
			}
		}
		else
		{
			$arr[] = $char;
			$str = substr($str, 1);
		}
	}
	return join(array_reverse($arr));
}

$f = fopen("q.txt", "r");
while(!feof($f)) {
	$line = fgets($f);
	echo cstrrev(trim($line))."\n";
}
fclose($f);

非常好，一直也想寫这种程序… ^o^