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$site = isset($_GET['site']) ? $_GET['site'] : 'tutorialpro.org';

$site = $_GET['site'] ?? 'tutorialpro.org';

<?php
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print(PHP_EOL); // PHP_EOL is the newline character

// The above code is equivalent to
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print($site);
print(PHP_EOL);
// ?? chaining
$site = $_GET['site'] ?? $_POST['site'] ?? 'tutorialpro.org';

print($site);
?>

tutorialpro.org
tutorialpro.org
tutorialpro.org