[PHP] Realize to enter information in the address bar

Seriously, I only know that $_GET can display data in the url. . . Others are not really understand


directly on the bar code

<?php
if(isset($_GET['number'])){
    
    
    foreach ($_GET as $num){
    
    
        $number = rand(1, 99);
        if($_GET == $number){
    
    
            echo "you got it";
        } else {
    
    
            echo "try again. The right answer is $number.<br>";
        }
}}else{
    
    
    echo 'no number.';
}

The display is like this.
Then there is one point that controls the "variable" in the url, which is in parentheses after get. For example, change to

if(isset($_GET['num']))

In the address bar, you have to write num=how many.