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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();
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
object(Exception)#3 (7) { ["message":protected]=> string(0) "" ["string":"Exception":private]=> string(0) "" ["code":protected]=> int(0) ["file":protected]=> string(9) "/in/MPjth" ["line":protected]=> int(16) ["trace":"Exception":private]=> array(1) { [0]=> array(6) { ["file"]=> string(9) "/in/MPjth" ["line"]=> int(20) ["function"]=> string(4) "test" ["class"]=> string(3) "Foo" ["type"]=> string(2) "->" ["args"]=> array(0) { } } } ["previous":"Exception":private]=> NULL }
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
Parse error: syntax error, unexpected '(' in /in/MPjth on line 16
Process exited with code 255.

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