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run code in 150+ php & hhvm versions
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<?php class A { public $params = array('extract-core' => 'no'); public function __invoke() { var_dump(!(strtolower($this->params['extract-core']) === "no"));var_dump($this->params['extract-core']); } } $A = new A(); $A();
based on 6VMeT
Output for 5.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
bool(false) string(2) "no"
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.2.17
Fatal error: Function name must be a string in /in/uYBGH on line 9
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/uYBGH 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/uYBGH 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/uYBGH on line 3
Process exited with code 255.