3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php function machine_forget(&$data) { $data = null; } $answer = 90; var_dump((string)$answer); machine_forget($answer); var_dump((string)$answer); // shhh no spoilers class zombie { protected $val; public function __construct($val) { $this->val = $val; } public function __destruct() { $this->vessel = $this; } public function __toString() { return $this->val; } } $answer = new zombie("42"); $answer->vessel = &$answer; var_dump((string)$answer); machine_forget($answer); var_dump((string)$answer);
based on BF4pS
Output for 5.2.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(2) "90" string(0) "" string(2) "42" string(2) "42"
Output for 5.1.0 - 5.1.6
string(2) "90" string(0) "" string(12) "Object id #1" string(12) "Object id #1"
Output for 5.0.5
string(2) "90" string(0) "" string(12) "Object id #1" string(0) ""
Output for 5.0.0 - 5.0.4
string(2) "90" string(0) "" string(12) "Object id #1" string(0) ""
Process exited with code 139.
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/dNbe8 on line 15
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/dNbe8 on line 15
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/dNbe8 on line 15
Process exited with code 255.