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<?php

//If your array has unique array values, then determining the first and last element is trivial:

foreach($array as $element) {
    if ($element === reset($array))
        echo 'FIRST ELEMENT!';

    if ($element === end($array))
        echo 'LAST ELEMENT!';
}
//This works if last and first elements are appearing just once in an array, otherwise you get false positives. Therefore, you have to compare the keys (they are unique for sure).

foreach($array as $key => $element) {
    reset($array);
    if ($key === key($array))
        echo 'FIRST ELEMENT!';

    end($array);
    if ($key === key($array))
        echo 'LAST ELEMENT!';
}