John Davidson

Message:

I saw an example at w3schools:

<?php

// Create an Iterator

class MyIterator implements Iterator {

  private $items = [];

  private $pointer = 0;



  public function __construct($items) {

    // array_values() makes sure that the keys are numbers

    $this->items = array_values($items);

  }



  public function current() {

    return $this->items[$this->pointer];

  }



  public function key() {

    return $this->pointer;

  }



  public function next() {

    $this->pointer++;

  }



  public function rewind() {

    $this->pointer = 0;

  }



  public function valid() {

    // count() indicates how many items are in the list

    return $this->pointer < count($this->items);

  }

}



// A function that uses iterables

function printIterable(iterable $myIterable) {

  foreach($myIterable as $item) {

    echo $item;

  }

}



// Use the iterator as an iterable

$iterator = new MyIterator(["a", "b", "c"]);

printIterable($iterator);

?>

Can current method loop the arrays if it a associative array and not numeric.If yes how can i do it ? Example can we do something like this :

function printIterable(iterable $myIterable) {

  foreach($myIterable as $item => $value) {

    echo  "$item - $value";

  }

}



// Use the iterator as an iterable

$iterator = new MyIterator(["a"=>1, "b"=>2, "c"=>3]);

printIterable($iterator);

When i try it. It print this : 0 - 11 - 22 - 3

---

My Answer:
No, the Iterator interface in PHP can work with any type of data structure, not just numeric arrays. It allows you to iterate over objects that implement the Iterator interface, which can be used to traverse through elements in a custom data structure.

The example you saw at w3schools may have used a numeric array for simplicity, but the Iterator interface can be implemented in a variety of ways to work with different types of data structures.