3v4l.org

run code in 300+ PHP versions simultaneously
<?php class X { var $value; function get() { return null !== $this->value ? $this->value : ($this->value = $this->getLongCalculation()); } function getLongCalculation() { sleep(3); return 5; } } $x = new X; var_dump($x->get()); var_dump($x->get());
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.1.3 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6

Process exited with code 137.
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.2
Strict Standards: var: Deprecated. Please use the public/private/protected modifiers in /in/erkvJ on line 4
Process exited with code 137.
preferences:
205.94 ms | 401 KiB | 312 Q