Nested foreach() with different number of values - php

Question

If i have two arrays
$arr1 = array(1,2,3,4,5,6,7,8,9,10,11); // 11 values
$arr2 = array('m1','m2','m3','m4','m5'); // 5 values
it is clear they have different number of values
and i want to use foreach() to print out as follow
1-m1
2-m2
3-m3
4-m4
5-m5
6-m1 <--- it start pick from $arr2
7-m2
8-m3
9-m4
10-m5
11-m1 <--- it start pick from $arr2
each value from $arr1 will pick value of same key from arr2 till arr2 ends then will repick from the start of $arr2 and so on

Answer 1

This is fairly simple logic.
Define a variable ($key) outside of your loop (starting at 0 because array indexes start at 0), and create a variable ($arr2_max) to hold the max amount of values in $arr2.
On each loop, check if $key is equal to the max amount of values in $arr2, if it is, set $key back to 0. Also increment $key by 1 at the end of each loop.
$arr1 = array(1,2,3,4,5,6,7,8,9,10,11); // 11 values
$arr2 = array('m1','m2','m3','m4','m5'); // 5 values
$key = 0;
$arr2_max = count($arr2);
foreach($arr1 as $arr1_val) {
if($key == $arr2_max) $key = 0;
$arr2_val = $arr2[$key]; //this is the value from $arr2
echo "$arr1_val-$arr2_val<br>";
$key++;
}
Output:
1-m1
2-m2
3-m3
4-m4
5-m5
6-m1
7-m2
8-m3
9-m4
10-m5
11-m1
If your $arr2 is not numerically indexed, first use array_values() to make it numerically indexed. $arr2 = array_values($arr2);

Answer 2

You could just do a simple modulus operation to reset index back to zero on reaching size of $arr2.
<?php
$arr1 = array(1,2,3,4,5,6,7,8,9,10,11); // 11 values
$arr2 = array('m1','m2','m3','m4','m5'); // 5 values
$size = count($arr2);
foreach($arr1 as $index => $curr){
echo $curr,"-",$arr2[$index % $size],PHP_EOL;
}
Demo: https://3v4l.org/R6u2q
Update:
For arrays with non numerical keys, you could just do:
<?php
$arr1 = array(1,2,3,4,5,6,7,8,9,10,11); // 11 values
$arr2 = array('m1','m2','m3','m4','m5'); // 5 values
$values = array_values($arr2);
$size = count($arr2);
foreach($arr1 as $index => $curr){
echo $curr,"-",$values[$index % $size],PHP_EOL;
}