微信昵称带表情处理

数据表昵称字段设置属性为utf8mb4 utf8mb4_general_ci
存储数据的时候使用emoji_encode(nickname)
读取数据的时候使用emoji_decode(nickname)
直接清除表情的方法removeEmoji(nickname)

//对emoji表情转义
function emoji_encode($str){
    $strEncode = '';
    $length = mb_strlen($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;
        }
    }
//    $strEncode = removeEmoji($strEncode);
    return $strEncode;
}
//对emoji表情转反义
function emoji_decode($str)
{
    $strDecode = preg_replace_callback('|\[\[EMOJI:(.*?)\]\]|', function ($matches) {
        return rawurldecode($matches[1]);
    }, $str);
    return $strDecode;
}

//特殊字符二次排除
function removeEmoji($nickname) {
    $clean_text = "";
    // Match Emoticons
    $regexEmoticons = '/[\x{1F600}-\x{1F64F}]/u';
    $clean_text = preg_replace($regexEmoticons, '', $nickname);
    // Match Miscellaneous Symbols and Pictographs
    $regexSymbols = '/[\x{1F300}-\x{1F5FF}]/u';
    $clean_text = preg_replace($regexSymbols, '', $nickname);
    // Match Transport And Map Symbols
    $regexTransport = '/[\x{1F680}-\x{1F6FF}]/u';
    $clean_text = preg_replace($regexTransport, '', $nickname);
    // Match Miscellaneous Symbols
    $regexMisc = '/[\x{2600}-\x{26FF}]/u';
    $clean_text = preg_replace($regexMisc, '', $nickname);
    // Match Dingbats
    $regexDingbats = '/[\x{2700}-\x{27BF}]/u';
    $clean_text = preg_replace($regexDingbats, '', $nickname);
    return $clean_text;
}