ReverseArrayIterator.php

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<?php
class ReverseArrayIterator implements Iterator, Countable {
    protected $array;
 
    public function __construct( $array = [] ) {
        if ( is_array( $array ) ) {
            $this->array = $array;
        } elseif ( is_object( $array ) ) {
            $this->array = get_object_vars( $array );
        } else {
            throw new InvalidArgumentException( __METHOD__ . ' requires an array or object' );
        }
 
        $this->rewind();
    }
 
     public function current() {
        return current( $this->array );
     }
 
     public function key() {
        return key( $this->array );
     }
 
     public function next() {
        prev( $this->array );
     }
 
     public function rewind() {
        end( $this->array );
     }
 
     public function valid() {
        return key( $this->array ) !== null;
     }
 
     public function count() {
        return count( $this->array );
     }
}