3v4l.org

run code in 300+ PHP versions simultaneously
<?php error_reporting(E_ERROR); class B { /** * @param string $p * @return string */ function g($p) { if (!$p) { return null; } return $p; } } class C extends B { function f($p) { return $this->$p[0]; } /** * @param int $p * @return int */ function g($p) { $this->p = $p; $this->property = [42]; return $this->f($p); } } print (new C)->g('property' . $undeclared_global) . "\n";
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.28, 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 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
42
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
property
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/q2WM6 on line 28
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/q2WM6 on line 28
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/q2WM6 on line 28
Process exited with code 255.

preferences:
110.6 ms | 2521 KiB | 4 Q