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run code in 150+ php & hhvm versions
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<?php class A { /** @return string[] */ public function test() {return array_map(array($this, 'callback'), array('ааа', 'ббб', 'ввв'));} /** * @param string $value * @return string */ private function callback($value) {return mb_strtoupper($value);} } $a = new A(); echo print_r($a->test(), true);
Output for 5.6.7 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Array ( [0] => ААА [1] => БББ [2] => ВВВ )
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.5.35
Array ( [0] => ааа [1] => ббб [2] => ввв )
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/OipEQ on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/OipEQ 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/OipEQ on line 4
Process exited with code 255.