<?php

$myArr = $array = array('a', 'b', 0, 'c', null, 'd');
$count = count($myArr);
$index = 0;

foreach($myArr as $value)
{

   var_dump($value);
   $index++;
   if($index == $count)   
      echo "Its the last one here :)";
}

?>

string(1) "a"
string(1) "b"
int(0)
string(1) "c"
NULL
string(1) "d"
Its the last one here :)