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<?php class Foo { function bar($x) { $that = $this; $powerOfThree = function($x) use ($that) { return $that->square($x) * $x; }; return $powerOfThree($x); } private function square($x) { return $x * $x; } } $foo = new Foo(); var_dump($foo->bar(2));
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 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 - 8.2.18, 8.3.0 - 8.3.6
int(8)
Output for 5.3.0 - 5.3.29
Fatal error: Call to private method Foo::square() from context '' in /in/jnsOH on line 8
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/jnsOH on line 7
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION in /in/jnsOH on line 7
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/jnsOH on line 7
Process exited with code 255.

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