Does static variables in php persist across the requests?

Question

Static variable gotcha in php

I am from Java background and have switched to php for one project recently. I have found one unexpected behaviour in php.

Answer 1

No, while a static variable will stay for the current request you'll need to add it to a session to persist it's value across requests.

Example:

session_start();

class Car {
    public static $make;
    public function __construct($make) {
        self::$make = $make;
    }
}

$c = new Car('Bugatti');
echo '
' . Car::$make . '
';
unset($c);

if (!isset($_SESSION['make'])) {
    echo '
' . Car::$make . '
';
    $c = new Car('Ferrari');
    echo '
' . Car::$make . '
';
}

$_SESSION['make'] = Car::$make;

echo '
' . $_SESSION['make'] . '
';