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Sometimes called the rule of three, this is how you calculate the percentage of a number from another number.

For example, you have 2 numbers, 34 and 116. Let’s say 116 is the total number (100%), and we want to find out what percentage is 34 out of 100%.

Here’s how:

function percentage($amount, $total, $decimal = 2) {
	if(0 === (int)$total) {
		return $total;
	return number_format((((int)$amount / (int)$total) * 100), $decimal);

echo percentage(34, 116) . '%';

It’s simple math.

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