php有什么用

php是一个嵌套的缩写名称，是英文超级文本预处理语言，它的语法混合了C、Java、Perl以及php自创新的语法，主要用来做网站开发，许多小型网站都用php开发，因为php是开源的，从而使得php经久不衰。

1){// 多字节字符 
        $return.='%u'.strtoupper(bin2hex(mb_convert_encoding($str,'UCS-2',$encoding)));
      }else{
        $return.='%'.strtoupper(bin2hex($str));
      }
    }
    return$return;
  }
  
  functiongb2utf8($string,$encoding='utf-8',$from_encode='gb2312')
  {
    returnmb_convert_encoding($string,$encoding,$from_encode);
  }
  
}
?>

google code 上找到的另外一个类似脚本

=127)
            {
                $tmpString=bin2hex(iconv("gbk","ucs-2",substr($str,$i,2)));
                $tmpString=substr($tmpString,2,2).substr($tmpString,0,2);
                $retrunString.="%u".$tmpString;
                $i++;
            }else{
                $retrunString.="%".dechex(ord($str[$i]));
            }
        }
        return$retrunString;
    }
 
 
    functionescape($str)
    {
        preg_match_all("/[\x80-\xff].|[\x01-\x7f]+/",$str,$r);
        $ar=$r[0];
        foreach($aras$k=>$v)
        {
            if(ord($v[0])<128)
                $ar[$k]=rawurlencode($v);
            else
                $ar[$k]="%u".bin2hex(iconv("UTF-8","UCS-2",$v));
        }
        returnjoin("",$ar);
    }
 
    functionphpunescape($source)
    {
        $decodedStr="";
        $pos=0;
        $len=strlen($source);
        
        while($pos<$len)
        {
            $charAt=substr($source,$pos,1);
            if($charAt=='%')
            {
                $pos++;
                $charAt=substr($source,$pos,1);
                if($charAt=='u')
                {
                    // we got a unicode character 
                    $pos++;
                    $unicodeHexVal=substr($source,$pos,4);
                    $unicode=hexdec($unicodeHexVal);
                    $entity="&#".$unicode.';';
                    $decodedStr.=utf8_encode($entity);
                    $pos+=4;
                }else{
                    // we have an escaped ascii character 
                    $hexVal=substr($source,$pos,2);
                    $decodedStr.=chr(hexdec($hexVal));
                    $pos+=2;
                }
            }else{
                $decodedStr.=$charAt;
                $pos++;
            }
        }
        return$decodedStr;
    }
    
    
    functionunescape($str)
    {
        $str=rawurldecode($str);
        preg_match_all("/(?:%u.{4})|&#x.{4};|&#\d+;|.+/U",$str,$r);
        $ar=$r[0];
        #print_r($ar);
        foreach($aras$k=>$v)
        {
            if(substr($v,0,2)=="%u")
                $ar[$k]=iconv("UCS-2","UTF-8",pack("H4",substr($v,-4)));
            elseif(substr($v,0,3)=="&#x")
                $ar[$k]=iconv("UCS-2","UTF-8",pack("H4",substr($v,3,-1)));
            elseif(substr($v,0,2)=="&#")
            {
                //echo substr($v,2,-1)."";
                $ar[$k]=iconv("UCS-2","UTF-8",pack("n",substr($v,2,-1)));
            }
        }
        returnjoin("",$ar);
    }
 
?>