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run code in 150+ php & hhvm versions
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<?php function change_this(&$self = NULL) { $self = (object) array ('foo' => 100); } class test_case extends stdClass { public $foo = 1; public function test() { change_this($this); print 'test(): '; var_dump($this); $this->test_this(); } public function test_this() { print 'test_this: '; var_dump($this); } } $x = new test_case; $x->test();
Output for 7.1.0
test(): object(test_case)#1 (1) { ["foo"]=> int(1) } test_this: object(test_case)#1 (1) { ["foo"]=> int(1) }
Output for 5.0.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.0.14
test(): object(stdClass)#2 (1) { ["foo"]=> int(100) } test_this: object(test_case)#1 (1) { ["foo"]=> int(1) }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected '=', expecting ')' in /in/1JYHi on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected '=', expecting ')' in /in/1JYHi on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/1JYHi on line 3
Process exited with code 255.