PHP: Concatenate array element into string with ',' as the separator
<p>Is there a quick way ( existing method)  Concatenate array element into string with ',' as the separator? Specifically I am looking for a single line of method replacing the following routine:</p>

<pre><code>    //given ('a','b','c'), it will return 'a,b,c'
private static function ConstructArrayConcantenate($groupViewID)
{
 $groupIDStr='';
  foreach ($groupViewID as $key=&gt;$value)
 {
  $groupIDStr=$groupIDStr.$value;
  if($key!=count($groupViewID)-1)
    $groupIDStr=$groupIDStr.',';

 }  

 return $groupIDStr;
}
</code></pre>
