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<?php class mc { public function go(array $arr) { array_walk($arr, array($this, "walkIt")); } private function walkIt($val) { echo $val . "<br />"; } public function export() { return array($this, 'walkIt'); } } $data = array(1,2,3,4); $m = new mc; $m->go($data); array_walk($data, $m->export());
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
1<br />2<br />3<br />4<br /> Fatal error: Uncaught TypeError: array_walk(): Argument #2 ($callback) must be a valid callback, cannot access private method mc::walkIt() in /in/tfh7f:22 Stack trace: #0 /in/tfh7f(22): array_walk(Array, Array) #1 {main} thrown in /in/tfh7f on line 22
Process exited with code 255.
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.25, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.29 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33
1<br />2<br />3<br />4<br /> Warning: array_walk() expects parameter 2 to be a valid callback, cannot access private method mc::walkIt() in /in/tfh7f on line 22
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
1<br />2<br />3<br />4<br /> Fatal error: Call to private method mc::walkIt() from context '' in /in/tfh7f on line 22
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_ARRAY, expecting '&' or T_VARIABLE in /in/tfh7f on line 4
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/tfh7f 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/tfh7f 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/tfh7f on line 4
Process exited with code 255.

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