php emoji转码显示

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preg_match_all('/\[\[EMOJI:(.*?)\]\]/',$data['content'],$arr_content);//过滤掉emoji表情
foreach($arr_content[0] as $k=>$v){
        $emoji = str2emoji($v);
        $data['content'] = str_replace($v,$emoji,$data['content']);
}

function emoji2str($str){
    $strEncode = '';
    $length = ($str,'utf-8');
    for ($i=0; $i < $length; $i++) {
        $_tmpStr = mb_substr($str,$i,1,'utf-8');
        if(strlen($_tmpStr) >= 4){
            $strEncode .= '[[EMOJI:'.rawurlencode($_tmpStr).']]';
        }else{
            $strEncode .= $_tmpStr;
        }
    }
    return $strEncode;
}