Question

Possible Duplicate:
comma separated list in php

Problem:

I want to be able to iterate through a list of unknown size, and spit out a comma delimited list.

For example:

Input:
  $data = array();
  $data[0]['productId'] = 11;
  $data[1]['productId'] = 22;
  $data[2]['productId'] = 33;
  $data[3]['productId'] = 44;

The following code does the trick:

$prodsToCheck = "";
foreach ($data as $d) {
  $prodsToCheck .= $d['productId'].", ";
}
$prodsToCheck = substr($prodsToCheck, 0, strlen($prodsToCheck) - 2); // THIS IS THE IMPORTANT PART

print $prodsToCheck; die();

Result must be

11, 22, 33, 44

and NOT:

11, 22, 33, 44,

This can’t be the quickest way to do this… what is?

Answer 1

Your example and your code are incoherent, so I decided to ignore the example since the problem would be too simple otherwise.

You may use implode, array_map and an anonymous function like this:

$prodsToCheck = implode(
   ", ", 
   array_map(
       function($element) { return $element['productId'];}, 
       $data));

Completely untested and supposed to work with php 5.3+