3v4l.org

run code in 500+ PHP versions simultaneously
<?php namespace Loader { function register() { eval(<<<EOPHP namespace App; function strlen(\$str) { return 20; } EOPHP ); } } namespace App { echo __NAMESPACE__, PHP_EOL; echo strlen("foo"), PHP_EOL; \Loader\register(); echo __NAMESPACE__, PHP_EOL; echo strlen("foo"), PHP_EOL; }

preferences:
33.16 ms | 483 KiB | 6 Q