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run code in 200+ php & hhvm versions
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<?php class A { public function remove($key) { $val = $this->arr[$key] ?? null; unset($this->arr[$key]); return $val; } }
based on AuhV9
Output for 7.0.0 - 7.2.0
Output for 5.3.18 - 5.6.28
Parse error: syntax error, unexpected '?' in /in/UfVff on line 6
Process exited with code 255.