Question

array:

A-B-C-D-E-F

J is the son of C.
update array so:

A-B-C-J-D-E-F

how do I insert J after C in the array?

I also map the array in a loop (array of comments for display). Will this method take a very long time to perform?

Answer 1

You can use array_splice() with $length set to 0.

http://de.php.net/manual/en/function.array-splice.php

Example:

$arr_alphabet = array('a', 'b', 'd');
array_splice($arr_alphabet, 2, 0, 'c');
// $arr_alphabet is now: array('a', 'b', 'c', 'd');