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<?php $tests = [ "On", "Off" ]; foreach ($tests as $test) { $result = [ "test" => $test, "boolval" => boolval($test), "FILTER_VALIDATE_BOOLEAN" => filter_var($test, FILTER_VALIDATE_BOOLEAN, FILTER_NULL_ON_FAILURE) ]; $result["agreement"] = $result["boolval"] === $result["FILTER_VALIDATE_BOOLEAN"]; echo json_encode($result, JSON_PRETTY_PRINT), "\n"; }
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.21, 7.4.0 - 7.4.9, 8.0.0alpha1 - beta1
{ "test": "On", "boolval": true, "FILTER_VALIDATE_BOOLEAN": true, "agreement": true } { "test": "Off", "boolval": true, "FILTER_VALIDATE_BOOLEAN": false, "agreement": false }
Output for 5.4.0 - 5.4.45
Fatal error: Call to undefined function boolval() in /in/bOrhG on line 9
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/bOrhG on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/bOrhG on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/bOrhG on line 2
Process exited with code 255.