PHP Program to find GCD

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What is Greatest Common Divisor?

A largest number that exactly divides two or more integers.

In general, Greatest Common Divisor (GCD) is otherwise called as Greatest Common Factor (GCF) or Highest Common Factor (HCF)

Tips: It is recommended to use our online GCD calculator for better understanding.


The following table provides few examples of GCD of the given numbers.

4, 102
6, 51
15, 30 , 4515

GCD of Two Numbers

In the following example, we will find the GCD of the given two numbers (45, 90).


PHP Compiler
<?php $num1 = 45; $num2 = 90; $gcd = 1; for($i=2; $i<=$num1 && $i<=$num2; $i++) { // Checks if i is factor of both integers if(($num1 % $i == 0) && ($num2 % $i == 0)) $gcd = $i; } echo "GCD of $num1 and $num2: $gcd <br>"; ?>


GCD of 45 and 90: 45


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