Implode data from a multi-dimensional array

Question

I\'m a novice at PHP and I need a quick solution to the following problem but can\'t seem to come up with one:

I have a multi-dimensional array like so

Answer 1

array_map is a call back function, where you can play with the passed array. this should work.

$str = implode(',', array_map(function($el){ return $el['tag_id']; }, $arr));