如何检查数字是否是输入的倍数 - PHP

Question

What I am trying to build is a function that takes an input number and checks if the following number is a multiple of that number.

function checkIfMult($input,$toBeChecked){
   // some logic
}

example:

checkIfMult(2,4) // true
checkIfMult(2,6) // true
checkIfMult(2,7) // false

checkIfMult(3,6) // true
checkIfMult(3,9) // true
checkIfMult(3,10) // false

My first instinct was to use arrays

$tableOf2 = [2,4,6,8,10,12,14,16,18]

But then a call like this would be highly unpractical:

checkIfMult(6,34234215)

How can I check to see if something is a multiple of the input?

Answer 1

Use the % operator.

The Modulo operator divides the numbers and returns the remainder.

In math, a multiple means that the remainder equals 0.

function checkIfMult($input,$toBeChecked){
   return $toBeChecked % $input === 0; 
}

function checkIfMult($input, $toBeChecked){
   console.log('checkIfMult(' + $input +',' + $toBeChecked + ')', $toBeChecked % $input === 0);
   return $toBeChecked % $input === 0;
}

checkIfMult(2,4) // true
checkIfMult(2,6) // true
checkIfMult(2,7) // false

checkIfMult(3,6) // true
checkIfMult(3,9) // true
checkIfMult(3,10) // false

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