3v4l.org

run code in 300+ PHP versions simultaneously
<?php spl_autoload_register(function ($class) { class Foo{ public function __construct() { echo 'Foo'; } }; class Bar{}; class_alias('Foo', 'Bar'); var_dump(debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 2)); }, true, true); $bar = new Foo(); $bar2 = new Bar();

preferences:
31.2 ms | 402 KiB | 5 Q