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如何正确实现PHP生成唯一标识符

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Release： 2016-06-13 11:10:51
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PHP生成唯一标识符代码示例：

  1.  ?  
  2. //生成唯一标识符   
  3. //sha1()函数， "安全散列算法（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生成唯一标识符函数描述及例子

<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>
</li>
<li class="alt"><span> </span></li>
</ol>
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