How can I use php loop inside if else statement

Solution:

There's no need for a loop here. If your intention is to whitelist the available languages then put a list in an array and usein_array():

$languages = ['ar','de','en'];
if (isset($_GET['language']) && in_array($_GET['language'], $languages)) {
    $_SESSION['language'] = $_GET['language'];
} else {
    $_SESSION['language'] = $default_language;
}
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Solution:

You don't need to doisset andempty asempty will do that for you.

This also checks if the language is in one of the specific ones (usingin_array) and if it isn't then it uses the default...

if (!empty($_GET['language']) && $_SESSION['language'] !== $_GET['language']) {
    $_SESSION['language'] = in_array($_GET['language'], ['en', 'ar', 'de'])
            ? $_GET['language'] : $default_language;
}
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