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@ 2014-10-20T20:31:47Z

<?php
class TestData {
    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(TestData::testData(false));
var_dump(TestData::testData(true));
var_dump(TestData::testData('true'));
var_dump(TestData::testData('false'));
var_dump(TestData::testData('yes'));
var_dump(TestData::testData('no'));
var_dump(TestData::testData(''));
var_dump(TestData::testData(1));
var_dump(TestData::testData(0));

Output for git.master, git.master_jit, rfc.property-hooks: string(3) "nok" string(2) "ok" string(2) "ok" string(3) "nok" string(2) "ok" string(3) "nok" string(4) "null" string(2) "ok" string(3) "nok"

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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