3v4l.org

run code in 300+ PHP versions simultaneously
<?php class Foo { public function __toString() { static $i = 0; return (string) $i++; } } function test(string $foo = new Foo()) { var_dump($foo); } test(); test(); test();
Output for 8.1.0 - 8.1.33, 8.2.16 - 8.2.29, 8.3.5 - 8.3.25, 8.4.1 - 8.4.12
string(1) "0" string(1) "1" string(1) "2"
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.25
Fatal error: Constant expression contains invalid operations in /in/3SU3D on line 10
Process exited with code 255.
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