Put value in three different arrays every third time - php

Question

I have a foreach in which I have three different arrays. I want to put the value - when running the foreach - in the different arrays every third time (look example below for better explanation).
Ex: arr = blue, red, green, yellow, brown
arr1 = blue, yellow arr2 = red, brown arr3 = green
I have this code (but dont work because the modulus doesn't come down to the last if statement more then the first execution of the if).
$count = 0;
foreach($values as $value){
if($count%2){
$arrSecond[] = $value[img][url];
}
else if($count%3){
$arrThird[] = $value[img][url];
}
else {
$arrFirst[] = $value[img][url];
}
$count++;
}
How can I solve this?

Answer 1

You need to be using modulus 3 the whole time only with different offsets:
foreach($values as $value){
$mod = $count%3;
if($mod == 1){
$arrSecond[] = $value['img']['url'];
}
// elseif, not else if!
elseif($mod == 2){
$arrThird[] = $value['img']['url'];
}
else {
$arrFirst[] = $value['img']['url'];
}
$count++;
}

Answer 2

Or you could simply make a single array:
$count = 0;
$data = array();
foreach($source as $value) {
$data[$count % 3][] = $value[img][url];
$count++;
}
That gives you 3 sub arrays with the $value stuff spread out evening within them.

Answer 3

what you can do is the following:
$count = 0;
foreach($values as $value){
switch($count){
case 0:
$arrFirst[] = $value[img][url];
$count = 1;
break;
case 1:
$arrSecond[] = $value[img][url];
$count = 2;
break;
case 2:
$arrThird[] = $value[img][url];
$count = 0;
break;
}
}
This is basically a 3 state state machine which should be more efficient than using modulus for a large number of images.