Define an array
// Define an array.
$my_array = [a,b,c,d];
// Define an array (the old standard way < php 5.3).
$my_array = array(a,b,c,d);
Get the last element of an array
$lastEl = array_pop((array_slice($array, -1)));
Count the number of element in an array
$total = count($array);