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run code in 300+ PHP versions simultaneously
<?php class C { function foo() { // return new DOMElement("a"); return null; } } $c = new C; var_dump($c->foo()->hasAttribute("href") ?? "foobar");
Output for 7.0.0 - 7.0.33, 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 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
Fatal error: Uncaught Error: Call to a member function hasAttribute() on null in /in/UpTmR:12 Stack trace: #0 {main} thrown in /in/UpTmR on line 12
Process exited with code 255.
Output for 5.6.0 - 5.6.40
Parse error: syntax error, unexpected '?' in /in/UpTmR on line 12
Process exited with code 255.

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