微信过滤特殊表情符号

function remove_emoji($string)
{
    $regex_emoticons = '/[x{1F600}-x{1F64F}]/u';
    $clear_string = preg_replace($regex_emoticons, '', $string);

    // Match Miscellaneous Symbols and Pictographs
    $regex_symbols = '/[x{1F300}-x{1F5FF}]/u';
    $clear_string = preg_replace($regex_symbols, '', $clear_string);

    // Match Transport And Map Symbols
    $regex_transport = '/[x{1F680}-x{1F6FF}]/u';
    $clear_string = preg_replace($regex_transport, '', $clear_string);

    // Match Miscellaneous Symbols
    $regex_misc = '/[x{2600}-x{26FF}]/u';
    $clear_string = preg_replace($regex_misc, '', $clear_string);

    // Match Dingbats
    $regex_dingbats = '/[x{2700}-x{27BF}]/u';
    $clear_string = preg_replace($regex_dingbats, '', $clear_string);

    return $clear_string;
}