移除微信昵称中的 emoji 字符:
function removeEmoji($nickname) {$clean_text = "";
$regexEmoticons = '/[\x{1F600}-\x{1F64F}]/u';
$clean_text = preg_replace($regexEmoticons, '', $text);
$regexSymbols = '/[\x{1F300}-\x{1F5FF}]/u';
$clean_text = preg_replace($regexSymbols, '', $clean_text);
$regexTransport = '/[\x{1F680}-\x{1F6FF}]/u';
$clean_text = preg_replace($regexTransport, '', $clean_text);
$regexMisc = '/[\x{2600}-\x{26FF}]/u';
$clean_text = preg_replace($regexMisc, '', $clean_text);
$regexDingbats = '/[\x{2700}-\x{27BF}]/u';
$clean_text = preg_replace($regexDingbats, '', $clean_text);
return $clean_text;
}
function filterEmoji($str)
{$str = preg_replace_callback('/./u',
function (array $match) {return strlen($match[0]) >= 4 ? '' : $match[0];
},
$str);
return $str;
}