div.leftNonNumeric

Code example

<?php declare(strict_types = 1);

function divide(bool $flag, int $denominator): float
{
	return $flag / $denominator;
}

Why is it reported?

This error is reported by phpstan/phpstan-strict-rules.

The left operand of a division operator (/) is not a numeric type (int or float). Division is an arithmetic operation that only makes sense with numeric values. Using a non-numeric type like bool, array, object, or null on the left side of a division indicates a logic error.

In the example above, $flag is a bool, which is not a valid numeric operand for division.

How to fix it

Use a numeric value as the left operand:

 <?php declare(strict_types = 1);

-function divide(bool $flag, int $denominator): float
+function divide(int $numerator, int $denominator): float
 {
-	return $flag / $denominator;
+	return $numerator / $denominator;
 }

Or convert the value to a numeric type before dividing:

 <?php declare(strict_types = 1);

 function divide(bool $flag, int $denominator): float
 {
-	return $flag / $denominator;
+	return (int) $flag / $denominator;
 }