PHP explode array then loop through values and output to variable

Question

The string I am trying to split is $item[\'category_names\'] which for example contains Hair, Fashion, News

I currently have the following

Answer 1

The error in your code is this:

$categories = "" . $cat . "\n";

You are overwriting $categories at each iteration, it should be:

$categories .= "" . $cat . "\n";

Not sure if I am going the right way about this?

find and replace isn't what explode is for. If you just want to correct the code error - see above.

This is more efficient:

$categories = "" .
    str_replace(', ', "\n", $input) . 
    "\n";

And this also accounts for variable whitespace:

$categories = "" . 
    preg_replace('@\s*,\s*@', "\n", $input) . 
    "\n";