array to string help

I have a array like so

// results from db
$v[0] = 'blue';
$v[1] = 'red';
$v[2] = 'green';
// the size of the array can change based on the number of the colors for each product

// I need to output it in a input text box like the following
$value = 'blue,red,green';

// I figure some type of loop but I' don't know which one

$value = implode(',', $v);

thanks I didn't realize the implode made it s string.

What else would it have been turned into? ;)