Online PHP editor | rfc for g9rMO

@ 2014-07-02T03:37:31Z

<?php


$answer = 42;


// The Setup
settype($answer, 'integer');
$s = (string) $a = &$answer;
$ns = (string) $n = (isset($s[1])) ? ($a >> 1)+$s[1] : ($a >> 1)+$s[0];
$f = ((int) $ns[0] ^ (int) $s[1]);

// The Riddle
function riddle($a, $n, $s, $f, $ns) {
	if (
		($a != 0 && luhn($a)) &&
		(!$f) &&
		(($n | $a) == 63) &&
		(!isset($s[2]))
	) {
		return TRUE;
	}
	return FALSE;
}

// The Result
if (riddle($a, $n, $s, $f, $ns)) {
	echo "You got the correct answer! ($a)";
} else {
	echo "Sorry, wrong answer. ($a)";
}






function luhn($number) {
	settype($number, 'string');
	$sumTable = array(
		array(0,1,2,3,4,5,6,7,8,9),
		array(0,2,4,6,8,1,3,5,7,9));
	$sum = 0;
	$flip = 0;
	for ($i = strlen($number) - 1; $i >= 0; $i--) {
		$sum += $sumTable[$flip++ & 0x1][$number[$i]];
	}
	return $sum % 10 === 0;
}

Output for git.master, git.master_jit, rfc.property-hooks: You got the correct answer! (42)

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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