How to determine whether a prime number is in php

php method to determine whether it is a prime number: first create a PHP sample file; then use the customized "function check_ss($num) {...}" method to determine whether the specified number is a prime number.

The operating environment of this article: windows7 system, PHP7.1 version, DELL G3 computer

php determines whether it is a prime number:

The code is as follows:

<?php
    check_ss(8);
 
    function check_ss($num) {
        for($i=2; $i < $num ; $i++) {
            if($num % $i == 0) {
                echo $num. &#39;不是素数&#39;;
                exit;
            }
        }
         
        echo $num. &#39;是素数&#39;;
    }

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