How to determine the first and last iteration in a foreach loop?

Question

The question is simple. I have a foreach loop in my code:

foreach($array as $element) {
    //code
}

In this loop, I want to r

Answer 1

You can use an anonymous function, too:

$indexOfLastElement = count($array) - 1;
array_walk($array, function($element, $index) use ($indexOfLastElement) {
    // do something
    if (0 === $index) {
        // first element‘s treatment
    }
    if ($indexOfLastElement === $index) {
        // last not least
    }
});

Three more things should be mentioned:

• If your array isn‘t indexed strictly (numerically) you must pipe your array through array_values first.
• If you need to modify the $element you have to pass it by reference (&$element).
• Any variables from outside the anonymous function you need inside, you‘ll have to list them next to $indexOfLastElement inside the use construct, again by reference if needed.