3v4l.org

run code in 300+ PHP versions simultaneously
<?php ini_set('display_errors', 'On'); error_reporting(E_ALL); define('bar', 'foo'); $a = ['foo' => 'Foo!', 'bar' => 'Bar!']; echo 'Defined bar as "', bar, '"', PHP_EOL; echo "Hello, $a[bar]", PHP_EOL;
Output for 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 - 8.3.27, 8.4.1 - 8.4.14
Defined bar as "foo" Hello, Bar!

preferences:
156.76 ms | 407 KiB | 5 Q