Php Code to find whether a number Armstrong or not?

The Php Code to find whether a number Armstrong or not is :

<?php

function armstrongCheck($number){

    $sum = 0; 

    $x = $number; 

    while($x != 0) 

    { 

        $rem = $x % 10; 

        $sum = $sum + $rem*$rem*$rem; 

        $x = $x / 10; 

    } 

    if ($number == $sum)

        return 1;

    return 0;   

}

$number = 153;

$flag = armstrongCheck($number);

if ($flag == 1)

    echo "Yes";

else

    echo "No"

?>