01c11-1.php

介绍PHP5的给类型函数应用

<?php
// A function to return a unique identifier for the user's browser
function create_unique() {
	// Read the user agent, IP address, current time, and a random number:
	$data = $_SERVER['HTTP_USER_AGENT'] . $_SERVER['REMOTE_ADDR'] . 
			time() . rand();
	
	// Return this value hashed via sha1
	return sha1($data);
}

// Echo out the hashed data - This will be different every time.
$newhash = create_unique();
echo "<pre>{$newhash}</pre>";
?>