How to remove emoji in php

How to remove emoji in php: First create a PHP sample file; then filter out emoji through the "function filterEmoji($str){...}" method.

The operating environment of this tutorial: Windows 7 system, PHP version 7.1, Dell G3 computer.

php to remove emoji expression code

I have been looking for it for a long time, and I personally tested the available code

// 过滤掉emoji表情
function filterEmoji($str)
{
    $str = preg_replace_callback(
            '/./u',
            function (array $match) {
                return strlen($match[0]) >= 4 ? '' : $match[0];
            },
            $str);
     return $str;
 }

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