calculate specific values of counter inside foreach loop

Question

I am trying to calculate specific values of a counter in my foreach loop.

I have this if statement in my code

if ( $i == 21 || $i == 41 || $i == 61 || $i == 81 || $i == 101 )

which are equal to

($i * 20) + 1

Instead of writing all these values (21,41,61,81...) I want to create a formula for my code but I couldn't figure out what the result should be equal to inside my if statement

rjdown · Accepted Answer · 2015-12-02 23:15:11Z

3

Use modulus:

if ($i % 20 == 1) { ...

http://php.net/manual/en/language.operators.arithmetic.php

answered Dec 2, 2015 at 23:15

rjdown

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2 Comments

Dejavu Over a year ago

does it output these values ? (21,41,61,81...)

rjdown Over a year ago

It will calculate if $i is 21, 41, 61 or 81. Note that it will also match 1, so you might want if ($i % 20 == 1 && $i > 1) { if you do not want to include it.

Matiu Carr · Accepted Answer · 2015-12-02 23:17:35Z

0

Look for the remainder after dividing by 20 using the % operator (modulus).

if ($i%20 == 1)
{
    // do stuff
}

answered Dec 2, 2015 at 23:17

Matiu Carr

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