PHP array explode count number of element

Small example:

$itemList = explode(",", $itemList);

echo count($itemList);                              
       for($i=0;$i<count($itemList);$i++)

Real code:

<?php
$imgURL = "../users/awmayhall/images/andrew1.jpg:../users/awmayhall/images/andrew2.jpg:";
$delimiter=":";
$itemList = array();
$itemList = explode($delimiter, $imgURL);
foreach($itemList as $item)
{
  echo"<img src='".$item."' longdesc='".$item."'/>";
}
?>