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<?php class Foo { protected $callback; public function __construct() { $this->callback = function (Exception $e) { var_dump($e); }; } public function test() { ($this->callback)($new Exception); } } (new Foo)->test();
based on kecbA
Output for 7.0.0
Parse error: syntax error, unexpected 'Exception' (T_STRING), expecting ',' or ')' in /in/mfU9J on line 16
Process exited with code 255.
Output for 5.3.20 - 5.6.16
Parse error: syntax error, unexpected '(' in /in/mfU9J on line 16
Process exited with code 255.