How to remove php variable value by page refresh

Question

I am setting a value to a variable by getting like $value=GET['value']. Now i want to remove the value when i refresh the page. how todo? any help.

below this question also asking same thing, but there I could not find any suitable answer.

How to delete $_POST variable upon pressing 'Refresh' button on browser with PHP?

Answer 1

This code removes everything from _GET:

// Need to check to prevent loop
if(empty($_GET)){
    // DO SOMETHING ON SECOND LOAD AFTER REMOVING
}else{
    // Do something with _GET before removing
    header('Location: ' . basename(__FILE__));
}

---

If removing specific values from GET is what you want, use is my little beast (this code allows you to do something before removing):

// Removes $arr keys from GET
function removeGETKeys($arr = array()){
    $tmp = array();
    foreach($arr as $v){
        $tmp[$v] = '';
    }
    return array_diff_key($_GET, $tmp);
}

// Checks if the keys are already removed
function checkRemoved($arr = array()){
    foreach($arr as $v){
        if(array_key_exists($v, $_GET)){
            return false;
        }
    }
    return true;
}

// The keys to remove from GET
$remove = array('foo', 'bar');

// Prevent page loop
if(checkRemoved($remove)){
    // Do something on second load AFTER removing
    echo 'Result: <br>';
    print_r($_GET);
}else{
    // Do something with _GET BEFORE removing
    $removed = removeGETKeys($remove);
    $path = basename(__FILE__);
    $i = 0;
    // recreate the keys
    foreach($removed as $k => $v){
        $path .= $i==0 ? "?$k=$v" : "&$k=$v";
        $i++;
    }
    // redirects without the selected keys
    header('location: ' . $path);
}

Example link:

t1.php?foo=123&bar=123&value=123

Final link:

t1.php?value=123

Final page content:

Result: 
Array ( [value] => 123 )

---

I tested this in different ways but might still bug. Tested the following:

• GET params that aren't in the $remove list: ✓
• Removing no GET params ($remove != GET): ✓
• Removing all $remove from GET: ✓
• Empty $remove: ✓
• Empty GET: ✓

All theses tests seem to work as expected. If you see any mistakes, let me know, please.