How to convert an array to a string in PHP

Question

What can I do to get the array values and store them as a comma-separated string?

Array ( [0] => 33160,
        [1] => 33280,
        [2] => 33180,
        [3] => 33163,
        [4] => 33181,
        [5] => 33164,
        [6] => 33162,
        [7] => 33179,
        [8] => 33154,
        [9] => 33008,
        [10] => 33009,
        [11] => 33161,
        [12] => 33261,
        [13] => 33269,
        [14] => 33169,
        [15] => 33022,
        [16] => 33141,
        [17] => 33168,
        [18] => 33020,
        [19] => 33023,
        [20] => 33019,
        [21] => 33153,
        [22] => 33238,
        [23] => 33138,
        [24] => 33167,
        [25] => 33082,)