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PHP: Meaning of the Percent Sign as Operator

Question by Guest | 05/06/2014 at 15:19

I just sniffed a bit in a foreign PHP code and discovered an operator which was not known to me so far.

It is the percent sign:

$v = $x % 10;

Obviously, it is used just like the operators +, -, * and /. But what can it mean?



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The percent sign is the modulus operator (MOD), which is used not only in PHP but also in many other programming languages.

The modulus operator always returns the remainder of a division operation.

Here is a small example:

12 % 10 = 2 (10 fits one times in 12, that is a remainder of 2)

10 % 5 = 0 (5 fits two times in 10, without remainder)

3 % 7 = 3 (7 does not fit any times in 3, so 3 remains)

This operator can be used, for example, to create recurring rows of numbers. For instance, when increasing the variable $i within a loop, at each iteration, $i%2 alternating is 0 or 1.
07/06/2014 at 22:15

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