PHP Hash Implementation using DJB

hash.php

<?php

class Hash {
	var $buckets = array();
	
	function put($key, $value) {
		$this->buckets[$this->generate_hash($key)] = $value;
	}
	
	function get($key) {
		return $this->buckets[$this->generate_hash($key)];
	}
	
	function generate_hash($str) {
		$hash = 5381;
		
		for($i = 0; $i < strlen($str); $i++) {
			$hash = (($hash << 5) + $hash) + ord($str[$i]);
		}
		
		return $hash;
	}
}

$h = new Hash();
$h->put("key1", "Hello World!");
$h->put("key2", "Goodbye World!");

echo $h->get("key1") . PHP_EOL;
echo $h->get("key2") . PHP_EOL;

pretty helpful！~

The djb hash algorithm depends on integer overflows and php has unpredictable behaviour about this (different version, architectures, etc.). This can lead to different results which of course is not something we want. :) You can read about it here: http://stackoverflow.com/questions/300840/force-php-integer-overflow

I've made some changes in this gist: https://gist.github.com/aralbald/5772554