PHP - Detailed explanation of Traversable interface

Traversable is used to detect whether a class can be traversed using foreach. This is an internal engine interface that cannot be implemented in PHP scripts. In actual programming, we use the Iterator interface or IteratorAggregate interface to implement traversal.

Interface summary:

Traversable {
}

<?php
    if( !is_array( $items ) && !$items instanceof Traversable )
        //Throw exception here
?>

<?php
$array=[1,2,3];
$obj = (object) $array;
var_dump($array instanceof \Traversable);
var_dump($obj instanceof \Traversable);
?>

<small>boolean</small><span>false</span>

When the class does not implement the Iterator interface or the IteratorAggregate interface, executing foreach traversal will output all the visible properties it can access

The above introduces the detailed explanation of the PHP - Traversable interface, including the relevant aspects. I hope it will be helpful to friends who are interested in PHP tutorials.