Detect emoticons in string

问题:

I found that you need PHP 7 and MySQL 5.5 to use emoticons in a string that you want to upload to the database. I don't have these specification on my server so I want to give an error message in laravel or php.

Is there a way to detect emoticons in php? If so then I can create a custom validation or something like that?

I've tried alpha_dash validation in Laravel but then it isn't possible to do one old-school like this one :-)

回答1:

Use the following function:

function remove_emoji($string) {

    // Match Emoticons
    $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;
}

回答2:

This is shamelessly copied and adjusted from this function here. So kudos to Huy Nguyen Quang who has written the original function.

function has_emojis_old( $string ) {

    preg_match( '/[\x{1F600}-\x{1F64F}]/u', $string, $matches_emo );

    return !empty( $matches_emo[0] ) ? true : false;

}

EDIT:

As pointed out there are some emojis that the above function do not detect. I've checked that and thats absolutely right.

Reason for that is that the function above checks an unicode range (similar to: is this character between 5 and 15). But there are many emojis that aren't in this range. It would be possible to just increase the unicode range but maybe there are some characters in that range that aren't emojis … so that seems not very elegant.

The original function checks multiple ranges and this may be the best solution. Thing is, this function was updated 4 years ago so it certainly do not reflect the current emoji palette.

Because im not very into emojis and their unicode ranges i can't provide a range based solution … instead i just check against all existing emoji unicodes:

function has_emojis( $string ) {

    // Array of emoji (v12, 2019) unicodes from https://unicode.org/emoji/charts/emoji-list.html

    $unicodes = array( 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);

    return preg_match( '/[\x{' . implode( '}\x{', $unicodes ) . '}]/u', $string ) ? true : false;

}

This function has – of course – to be updated for every new emoji release but that has to happen for ranged solutions as well.

回答3:

To follow on from Johannes answer I found a solution on a forum somewhere. This regex does the trick :)

    $unicodeRegexp = '([*#0-9](?>\\xEF\\xB8\\x8F)?\\xE2\\x83\\xA3|\\xC2[\\xA9\\xAE]|\\xE2..(\\xF0\\x9F\\x8F[\\xBB-\\xBF])?(?>\\xEF\\xB8\\x8F)?|\\xE3(?>\\x80[\\xB0\\xBD]|\\x8A[\\x97\\x99])(?>\\xEF\\xB8\\x8F)?|\\xF0\\x9F(?>[\\x80-\\x86].(?>\\xEF\\xB8\\x8F)?|\\x87.\\xF0\\x9F\\x87.|..(\\xF0\\x9F\\x8F[\\xBB-\\xBF])?|(((?<zwj>\\xE2\\x80\\x8D)\\xE2\\x9D\\xA4\\xEF\\xB8\\x8F\k<zwj>\\xF0\\x9F..(\k<zwj>\\xF0\\x9F\\x91.)?|(\\xE2\\x80\\x8D\\xF0\\x9F\\x91.){2,3}))?))';