Iterate in reverse through an array with PHP - SPL solution?

Question

Is there an SPL Reverse array iterator in PHP? And if not, what would be the best way to achieve it?

I could simply do

$array = array_reverse($array)         


        

Answer 1

Based on linepogl's answer, I came up with this function:

/**
 * Iterate an array or other foreach-able without making a copy of it.
 *
 * @param array|\Traversable $iterable
 * @return Generator
 */
function iter_reverse($iterable) {
    for (end($iterable); ($key=key($iterable))!==null; prev($iterable)){
        yield $key => current($iterable);
    }
}

Usage:

foreach(iter_reverse($my_array) as $key => $value) {
    // ... do things ...
}

This works on arrays and other iterables without first making a copy of it.