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run code in 150+ php & hhvm versions
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<?php class T { public $e; public function output() { $e = $this->e; echo $e('hi'); } } $t = new T; $t->e = function($str) { return str_reverse($str); }; $t->output();
Output for 7.0.0 - 7.1.0
Fatal error: Uncaught Error: Call to undefined function str_reverse() in /in/WmNHO:12 Stack trace: #0 /in/WmNHO(6): {closure}('hi') #1 /in/WmNHO(13): T->output() #2 {main} thrown in /in/WmNHO on line 12
Process exited with code 255.
Output for 5.3.0 - 5.6.28, hhvm-3.12.0
Fatal error: Call to undefined function str_reverse() in /in/WmNHO on line 12
Process exited with code 255.
Output for hhvm-3.10.0

Process exited with code 137.
Output for 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/WmNHO on line 12
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION in /in/WmNHO on line 12
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/WmNHO 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 T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/WmNHO on line 3
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/WmNHO on line 3
Process exited with code 255.