gistfile1.php

<?php
class LatestSearches {
	private $max = 25;
	private $filename;
	private $dom;
	
	public function __construct($file) {
		if(file_exists($file) && is_writable($file)) {
			$this->dom = new DOMDocument();
			if(!@$this->dom->load($file)) {
				throw new Exception('"'.$file.'" is not a valid XML file');
			} else {
				$this->filename = $file;
			}
		} else {
			throw new Exception('"'.$file.'" does not exists or is not writable.');
		}
	}
	
	public function addSearch($searchString) {
		$searchNode = $this->dom->createElement('search', $searchString);
		$this->dom->getElementsByTagName('searches')->item(0)->appendChild($searchNode);
		
		if($this->countEntries() > $this->max) {
			$firstSearchNode = $this->dom->getElementsByTagName('search')->item(0);
			$this->dom->getElementsByTagName('searches')->removeChild($firstSearchNode);
		}
		
		$this->dom->save($this->filename);
	}
	
	public function getLatestSearches($max = 25, $latestFirst = true) {
		$searches = array();
		$nbEntries = $this->countEntries();
		
		$i = 0;
		while($i < $nbEntries && $i < $max) {
			$searches[] = $this->dom->getElementsByTagName('search')->item($i)->firstChild->nodeValue;
			$i++;
		}
		
		if($latestFirst == true) {
			$searches = array_reverse($searches);
		}
		return $searches;
	}
	
	public function countEntries() {
		return $this->dom->getElementsByTagName('search')->length;
	}
}
?>