PHP check if variable is a whole number

Question

I have this PHP code:

$entityElementCount = (-($highScore-$totalKeywordCount))/0.29;

What i want to know is, how to check whether $

Answer 1

I would use intval function like this:

if($number === intval($number)) {

}

Tests:

var_dump(10 === intval(10));     // prints "bool(true)"
var_dump("10" === intval("10")); // prints "bool(false)"
var_dump(10.5 === intval(10.5)); // prints "bool(false)"
var_dump("0x539" === intval("0x539")); // prints "bool(false)"

Other solutions

1)

if(floor($number) == $number) {   // Currently most upvoted solution: 

Tests:

$number = true;
var_dump(floor($number) == $number); // prints "bool(true)" which is incorrect.

2)

if (is_numeric($number) && floor($number) == $number) {

Corner case:

$number = "0x539";
var_dump(is_numeric($number) && floor($number) == $number); // prints "bool(true)" which depend on context may or may not be what you want

3)

if (ctype_digit($number)) {

Tests:

var_dump(ctype_digit("0x539")); // prints "bool(false)"
var_dump(ctype_digit(10)); // prints "bool(false)"
var_dump(ctype_digit(0x53)); // prints "bool(false)"