使用PHP在字符串中抓取以@开头的单词[关闭]

Question

When a user posts a comment, I want to grab every word that starts with a @ symbol.

ex. string is 'Check this out @user1. It's a photo of @user2 and @user3.'

When I'm on the PHP side, I want to grab user1, user2, user3 so I can then notify those users that they have been tagged in this comment.

I tried playing with strpos, but closest I got was if the string started with @ using the logic below.

if (0 === strpos($string, '@')){ echo 'yes' }

but that wasn't what I needed.

Answer 1

You can simply use this function:

function get_tagged_users($comment) {
    $matches = array();
    if (preg_match_all('/@(\w+)\b/', $comment, $matches)) {
        return $matches[1];
    }
    return array();
}

It will return an array of usernames (without "@") and an empty array if no matches found or if an error occurred while doing regex.

Note: It uses regular definition of word boundaries and words. Lorem @ipsum-ed dolor will return just ipsum.

So if you need to include hypen (-) in usernames, just change regex with /@([-\w]+)\b/