0bc09.php

来自「介绍PHP5的给类型函数应用」· PHP 代码 · 共 30 行

<?php
// Declare a new class that extends FilterIterator into a Regex one.
class RegexFilterIterator extends FilterIterator {
	// Declare a property to hold the filter criteria
	private $criteria;
	
	// Now make our constructor, it needs to take an Iterator, and the regex
	public function __construct(Iterator $i, $regex) {
		// Call the parents constructor, and store the regex
		parent::__construct($i);
		$this->criteria = $regex;
	}

	// Define accept to do the regex check
	public function accept() {
		// Just see if the regex matches the current item:
		return preg_match($this->criteria, parent::current());
	}
}

// Now to test this, first define an array of values
$arr = array('Mimi', 'Wiley', 'Tux', 'Taz', 'Iyi', 'Thundar', 'Yowler');

// Now let's create a chained Iterator.  Make a FilterIterator that wraps
// around an ArrayIterator, and only allows items with a 'y' in them.
$it = new RegexFilterIterator(new ArrayIterator($arr), '/y/i');

// Now loop and echo these all out, should include Wiley, Iyi, Yowler.
foreach ($it as $entry) { echo "{$entry}<br />\n"; }
?>