Online PHP editor | refs for paUnd

<?php class TestCase { static $emptyValue = "null"; static $trueValue = "ok"; static $falseValue = "nok"; static $trueArray = array(1,'1',true,'true','yes' ); static $falseArray = array(0,'0',false,'false','no' ); static function testData($data) { if( in_array($data, self::$trueArray, true) ) { return self::$trueValue; } elseif( in_array($data, self::$falseArray, true) ) { return self::$falseValue; } else { return self::$emptyValue; } } } var_dump(TestCase::testData(false)); var_dump(TestCase::testData(true)); var_dump(TestCase::testData('true')); var_dump(TestCase::testData('false')); var_dump(TestCase::testData('yes')); var_dump(TestCase::testData('no')); var_dump(TestCase::testData('')); var_dump(TestCase::testData(1)); var_dump(TestCase::testData(0));