如何在php聊天中添加本机表情符号？

Question

如何在这里添加原生表情符号？ 因为我的php聊天不会识别它们： 在聊天框中，当我发送表情符号时，我得到了这个：????

        $mod_text = preg_replace( '/(http|https|ftp|ftps)\:\/\/[a-zA-Z0-9\-\.]+\.[a-zA-Z]{2,8}(\/*\S*)/' , "<span class=\"link-object\"><a class=\"dont-react\" href=\"$0\" target=\"_blank\">$0</a></span>" , escaper_html( $chat['text'] ) );



$array = array(
        'id' => $chat['id'],
        'time' => $chat['sendtime'],
        'img' => $chat['img_medium'],
        'img_big' => $chat['img_big'],
        'text' => $mod_text,
        'sticker' => $chat['sticker']?true:false,
        'sticker_format' => $chat['sticker']?get_sticker_pack( $chat['sticker_pack'] )['format']:'',
        'sticker_pack' => $chat['sticker_pack'],
        'sticker_index' => $chat['sticker_index']
    );