摘要：
function unescape($str)
{
$ret = '';
$len = strlen($str);
for ($i = 0; $i 6)).chr(0x80|($val&0x3f));
else $ret .= chr(0xe0|($val12)).chr(0x80|(($val6)&0x3f)).chr(0x80|($val&0x3f));
$i += 5;
}
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