javascript中的escape和unescape函數的php實現

escape函數

/**


js escape php 實現 
@param $string           the sting want to be escaped 
@param $in_encoding       
@param $out_encoding

*/ 
function escape($string, $in_encoding = 'UTF-8',$out_encoding = 'UCS-2') { 
 $return = ''; 
 if (function_exists('mb_get_info')) { 
 for($x = 0; $x < mb_strlen ( $string, $in_encoding ); $x ++) { 
     $str = mb_substr ( $string, $x, 1, $in_encoding ); 
     if (strlen ( $str ) > 1) { // 多字節字符 
         $return .= '%u' . strtoupper ( bin2hex ( mb_convert_encoding ( $str, $out_encoding, $in_encoding ) ) ); 
     } else { 
         $return .= '%' . strtoupper ( bin2hex ( $str ) ); 
     } 
 } 

 } 
 return $return; 
}
</pre> 

 
 unescape代碼： 
 
function unescape($str) 
{ 
 $ret = ''; 
 $len = strlen($str); 
 for ($i = 0; $i < $len; $i ++) 
 { 
 if ($str[$i] == '%' && $str[$i + 1] == 'u') 
 { 
     $val = hexdec(substr($str, $i + 2, 4)); 
     if ($val < 0x7f) 
         $ret .= chr($val); 
     else  
         if ($val < 0x800) 
             $ret .= chr(0xc0 | ($val >> 6)) . 
              chr(0x80 | ($val & 0x3f)); 
         else 
             $ret .= chr(0xe0 | ($val >> 12)) . 
              chr(0x80 | (($val >> 6) & 0x3f)) . 
              chr(0x80 | ($val & 0x3f)); 
     $i += 5; 
 } else  
     if ($str[$i] == '%') 
     { 
         $ret .= urldecode(substr($str, $i, 3)); 
         $i += 2; 
     } else 
         $ret .= $str[$i]; 

 } 
 return $ret; 
}</pre>