php explode on two dimensional array

I have a two dimensional array in php and I want to get the second dimension (index 1) as a list of values seperated by a comma. Do I have to write my own custom functions or can I use some variation of explode on two dimens开发者_Go百科ional arrays?

Depending on how your array is organized, you could do

x = implode(',',$two_dimensional_array['index1']);

First of all, your are looking for implode() and not for explode().

function flatten($two_dim_array)
{
     $result = array();
     foreach ($two_dim_array as $array)
          $result[] = implode("," $array);
     return $result;
}