php自定义函数实现JS的escape的方法示例

//php functionfunction escape($string) {    $n = $bn = $tn = 0;    $output = '';    $special = "-_.+@/*0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";    while($n < strlen($string)) {        $ascii = ord($string[$n]);        if($ascii == 9 || $ascii == 10 || (32 <= $ascii && $ascii <= 126)) {            $tn = 1;$n++;        } elseif(194 <= $ascii && $ascii <= 223) {            $tn = 2;$n += 2;        } elseif(224 <= $ascii && $ascii <= 239) {            $tn = 3;$n += 3;        } elseif(240 <= $ascii && $ascii <= 247) {            $tn = 4;$n += 4;        } elseif(248 <= $ascii && $ascii <= 251) {            $tn = 5;$n += 5;        } elseif($ascii == 252 || $ascii == 253) {            $tn = 6;$n += 6;        } else {            $n++;        }        $singleStr = substr($string,$bn,$tn);        $charVal = bin2hex(iconv('utf-8', 'ucs-2', $singleStr));        if(base_convert($charVal, 16, 10) > 0xff) {           if (!preg_match("/win/i", PHP_OS))            $charVal = substr($charVal, 2, 2).substr($charVal, 0, 2);          $output .= '%u' . $charVal;        }        else {            if(false !== strpos($special, $singleStr))               $output .= $singleStr;            else               $output .="%" . dechex(ord($string[$bn]));        }     $bn = $n;    }    return $output;}