# Check if a number is divisible by another number in PHP

In this tutorial, we are going to learn about how to check if a number is divisible by another number in PHP with the help of examples.

Consider, we have a following number:

`$a = 20`

To find if a above number `20`

is divisible by another number, we should divide the first number by second and get the remainder 0 then only we call it’s a divisible of another number otherwise it is not a divisible.

For example: 20%5 = 0

## Using % Modulo operator

To check if a number is divisible by another number, we can use the `%`

modulo operator in PHP.

The modulo `%`

operator returns the remainder of two numbers `20 % 5 = 0`

, so if we get a remainder `0`

then the given number is a divisible of another number otherwise it not a divisible.

Here is an example:

```
if (20 % 5 == 0) {
echo "20 is divisible by 5";
}else {
echo "20 is not divisible by 5";
}
```

Output:

`"20 is divisible by 5"`

In the above code we have added `20 % 5 == 0`

in if condition. so 20 is divided by 5 and returns the remainder 0 then it prints the output “20 is divisible by 5”.

Example 2 :

```
if (100 % 10 == 0) {
echo "100 is divisible by 10";
}else {
echo "100 is not divisible by 10";
}
```

Output:

`"100 is divisible by 10"`

## Checking if a number is not divisible by another

To check if a number is not a divisible of another number, we can use the modulo operator `%`

but the remainder of first number by second number is not equal to 0.

Here is an example:

```
if (25 % 10 != 0){
echo "25 is not divisible by 10";
}
```

In the above code, 25 is divided by 10 and returns the remainder 5. So the given number is not divisible of 10.