I have to create string like $zn = "43,49,57,3,68,69";
from following array without using loop :
Array
(
[0] => Array
(
['pk_id'] => 43
),
[1] => Array
(
['pk_id'] => 49
),
[2] => Array
(
['pk_id'] => 57
),
[3] => Array
(
['pk_id'] => 3
),
[4] => Array
(
['pk_id'] => 68
),
[5] => Array
(
['pk_id'] => 69
)
);
What are the ways I can do?
It should take less time and memory.