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run code in 300+ PHP versions simultaneously

@ 2016-03-06T14:26:38Z

<?php

class Foo {
        protected $b = null;

        protected static $instance = null;

        public static function get()
        {
                if (static::$instance === null) {
                        static::$instance = new static();
                }

                return static::$instance;
        }
        public function __construct()
        {
                echo __METHOD__ . PHP_EOL;
                $this->b = Bar::get();
        }

        public function __destruct()
        {
                echo __METHOD__ . PHP_EOL;
                $this->b->func();
        }
}

class Bar {
        public $destroyed = false;

        protected static $instance = null;

        public static function get()
        {
                if (static::$instance === null) {
                        static::$instance = new static();
                }

                return static::$instance;
        }

        public function __construct()
        {
                echo __METHOD__ . PHP_EOL;
        }

        public function __destruct()
        {
                echo __METHOD__ . PHP_EOL;
                $this->destroyed = true;
        }

        public function func()
        {
                echo __METHOD__ . PHP_EOL;
        }
}

Bar::get();
Foo::get();

Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0: Bar::__construct Foo::__construct Bar::__destruct Foo::__destruct Bar::func
Output for 8.4.15: /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.

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