How to implode after 4th value in array

[t_machine]

I hope someone can help with this problem. I have an array with many values and would like to implode a " - " after every 4th number. Example  1234-5678-91011...

 

My array: array(1, 2, 3, 4, 5, 6....

 

How can i use implode to add the " - "

 

Thanks for any help

[Ken2k7]

I think the easiest way (not the shortest) would be to loop through the array and add the numbers to a string as you go along. You'll probably want to keep track of a number so you'll know to add the hyphen when the 4th number comes up.

[Philip]

$original = array(1,2,3,4,5,6,7,8,9,0);
$temp = array();
foreach(array_chunk($original, 4) as $k=>$v) 
$temp[] = implode($v);
echo implode('-', $temp);

 

Displays:

1234-5678-90