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<?php class A { private $a = 5; public function foo() { $f = function () { return $this->a; }; return $f(); } } $a = new A; var_dump($a->foo());
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.18, 5.5.20 - 5.5.25, 5.5.27, 5.5.29 - 5.5.38, 5.6.1 - 5.6.5, 5.6.7 - 5.6.8, 5.6.10, 5.6.12 - 5.6.13, 5.6.15 - 5.6.24, 5.6.28, 5.6.32 - 5.6.38, 5.6.40, 7.0.0, 7.0.2 - 7.0.3, 7.0.6 - 7.0.15, 7.0.17, 7.0.20 - 7.0.29, 7.0.32 - 7.0.33, 7.1.0, 7.1.2 - 7.1.6, 7.1.8 - 7.1.29, 7.1.31 - 7.1.33, 7.2.0, 7.2.9 - 7.2.26, 7.3.0 - 7.3.13, 7.4.0 - 7.4.1, 8.1.24 - 8.1.28, 8.2.11 - 8.2.18, 8.3.0 - 8.3.6
int(5)
Output for 5.5.19, 5.5.26, 5.5.28, 5.6.0, 5.6.6, 5.6.9, 5.6.11, 5.6.14, 5.6.25 - 5.6.27, 5.6.29 - 5.6.31, 5.6.39, 7.0.1, 7.0.4 - 7.0.5, 7.0.16, 7.0.18 - 7.0.19, 7.0.30 - 7.0.31, 7.1.1, 7.1.7, 7.1.30, 7.2.1 - 7.2.8

Process exited with code 137.
Output for 5.3.0 - 5.3.29
Fatal error: Using $this when not in object context in /in/dHi6a on line 7
Process exited with code 255.
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/dHi6a on line 6
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION in /in/dHi6a on line 6
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/dHi6a on line 4
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
Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/dHi6a on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/dHi6a on line 4
Process exited with code 255.

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