php如何实现简体繁体转换

$data=array('侧'=>'側','厂'=>'廠');

function J2F($str){
	if(trim($str)==''){
		return '';
	}
	$fstr='';
    include 'J2FData.php';//此数据文件下面有下载地址
	$count=mb_strlen($str,'utf-8');
    for($i=0;$i<=$count;$i++){
        $jchar=mb_substr($str,$i,1,&#39;utf-8&#39;);
		//这里用到的$fantiData数组是在J2FData.php文件中定义的
        $fchar=isset($fantiData[$jchar])?$fantiData[$jchar]:$jchar;
        $fstr.=$fchar;
    }
    return $fstr;
}