Return single column 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

Array (     [0] => Array         (             [blogTags_id] => 1             [tag_name] => google             [inserted_on] => 2013-05-22 09:51:34             [inserted_by] => 2         )      [1] => Array         (             [blogTags_id] => 2             [tag_name] => technology             [inserted_on] => 2013-05-22 09:51:34             [inserted_by] => 2         ) ) 

I want to use the implode() to somehow return a comma-separated string containing values of tag_name key like so.

google, technology 

Is it possible to achieve this effect with the said function? If not then please suggest an alternate solution.

Answer 1

Quite simple:

$input = array(   array(     'tag_name' => 'google'   ),   array(     'tag_name' => 'technology'   ) );  echo implode(', ', array_map(function ($entry) {   return $entry['tag_name']; }, $input)); 

http://3v4l.org/ltBZ0

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and new in php v5.5.0, array_column:

echo implode(', ', array_column($input, 'tag_name'));