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run code in 150+ php & hhvm versions
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<?php class Something { private $value; private function __construct($value) { $this->value = $value; } public static function create($value) { return new self($value); } public function __toString() { return $this->value; } } var_dump(strval(Something::create("hallo")));
based on NWMI9
Output for 5.2.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
string(5) "hallo"
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.1.6
string(12) "Object id #1"
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/cvKaO on line 5
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/cvKaO on line 5
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/cvKaO on line 5
Process exited with code 255.