make array from comma separated string php code example

Example 1: array to string separated by comma php

$arr = array ( 0 => "lorem", 1 => "ipsum", 2 => "dolor");

$str = implode (", ", $arr);

Example 2: how to convert array to string with commas in php

$tags = implode(', ', array('tag1','tag2','tag3','tag4'));