php实现后台登录背景图获取的代码

<pre style="background-color:#262e37;color:#ffffff;font-family:&#39;Consolas&#39;,monospace;font-size:11.3pt;">$background <span style="color:#f92672;">= </span><span style="color:#e6db74;">&quot;http://img.infinitynewtab.com/wallpaper/&quot; </span><span style="color:#f92672;">. </span><span style="color:#66d9ef;font-style:italic;">mt_rand</span>(<span style="color:#ae81ff;">1</span>, <span style="color:#ae81ff;">4000</span>) <span style="color:#f92672;">. </span><span style="color:#e6db74;">&quot;.jpg&quot;</span>;</pre><p><br/></p>