0bc11.php

来自「介绍PHP5的给类型函数应用」· PHP 代码 · 共 35 行

<?php
// Include the library for Key Iteration
//require 'KeyArrayIterator.php';
require '0Bc07.php';

// Declare a new class that will extend our previous one, and implement
// the ability to do recursion
class RecursiveKeyArrayIterator extends KeyArrayIterator
								implements RecursiveIterator {
	// We need to define two methods to accomlish this.  First of all
	// Define a function to check if we happen to have 'children'
	public function hasChildren() {
		// In this case, children refers to this element being an array.
		return is_array($this->current()->value);
	}
	
	// Now we also need to declare a method to return the children
	public function getChildren() {
		// The way to actually access the children needs to be via an
		// Iterator, therefore just define a new Iterator here:
		return new RecursiveKeyArrayIterator($this->current()->value);
	}
}

// That was really all we had to do.  So to test this let's make an array
$arr = array(42, array(1973, 1974, 2005), 173, array('Tash', 'Livia'), 'a');

// Create the Iterator for us to use:
$it = new RecursiveIteratorIterator(new RecursiveKeyArrayIterator($arr));

// Now loop over the array. echoing it out with keys & Depth!
foreach ($it as $entry) {
	echo $it->getDepth(), ' - ', $entry->key, ' - ', $entry, "<br />\n";
}
?>