How to correctly implement PHP to generate unique identifiers_PHP Tutorial

What we want to introduce to you in detail today is the code example of

PHP generating unique identifier:

1. < ?
2. //Generate unique identifier
3. //sha1() function, "Secure Hash Algorithm (SHA1)"
4. function create_unique() {
5. $data = $_SERVER['HTTP_USER_AGENT'] . $_SERVER['REMOTE_ADDR']
6. .time () . rand();
7. return sha1($data);
8. //return md5(time().$data) ;
9. //return $data;
10. }
11. ?>

PHP generate unique identifier function description and examples

<ol class="dp-xml">
<li class="alt"><span><span class="tag"><</span><span> ?   </span></span></li><li><span>$</span><span class="attribute">newhash</span><span> = </span><span class="attribute-value">create_unique</span><span>();   </span></li><li class="alt"><span>echo $newhash;   </span></li><li><span class="tag">?></span><span>   </span></span></li>
<li class="alt"><span> </span></li>
</ol>