Fake super() function for PHP, just like parent::__construct().

super.php

<?php
function super(...$args) {
    $object = debug_backtrace(1, 2)[1]['object'];
    $parent = get_parent_class($object); // Let it errorize.
    if ($parent && method_exists($parent, '__construct')) {
        $ref = new ReflectionMethod($parent, '__construct');
        $ref->invoke($object, ...$args);
    }
}

class Foo {
    var $x;
    function __construct($x) {
        $this->x = $x;
    }
}
class SubFoo extends Foo {
    function __construct($x = null) {
        super($x ?? 123);
    }
}

var_dump(new SubFoo());
var_dump(new SubFoo(456));