PHP | Check if a number is Perfect number

PHP | Check if a number is armstrong number

Last Updated : 30 Apr, 2021

Given a number, we need to check whether it is an armstrong number or not in PHP. An Armstrong number is the one whose value is equal to the sum of the cubes of its digits.
Examples:

Input : 407
Output : Yes
407 = (4*4*4) + (0*0*0) + (7*7*7)  
    = 64 + 0 + 343  
    = 407  

Input : 303
Output : No

Approach: For every digit r in input number x, compute r³. If sum of all such values is equal to n, then print "Yes", else "No".

Php

<?php
// PHP code to check whether a number is 
// armstrong number or not

// function to check whether the number is 
// armstrong number or not
function armstrongCheck($number){
    $sum = 0;  
    $x = $number;  
    while($x != 0)  
    {  
        $rem = $x % 10;  
        $sum = $sum + $rem*$rem*$rem;  
        $x = $x / 10;  
    }  
    
    // if true then armstrong number
    if ($number == $sum)
        return 1;
    
    // not an armstrong number    
    return 0;    
}

// Driver Code
$number = 407;
$flag = armstrongCheck($number);
if ($flag == 1)
    echo "Yes";
else
    echo "No"
?>

Output:

Yes

Time Complexity: O(num), where num is the number of digits in the given number.

PHP | Check if a number is Perfect number

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