PHP---文件上传与下载，_PHP教程

<?<span>php
    </span><span>echo</span> '_FILES: <pre class="brush:php;toolbar:false">'<span>;
</span><span>//</span><span><pre class="brush:php;toolbar:false"> 标签的一个常见应用就是用来表示计算机的源代码。</span>
    <span>print_r</span>(<span>$_FILES</span><span>);
      
    </span><span>echo</span> '_POST: <pre class="brush:php;toolbar:false">'<span>;
    </span><span>print_r</span>(<span>$_POST</span><span>);
</span>?>

<?<span>php
    </span><span>$typeWhiteList</span> = <span>array</span>('txt', 'doc', 'php', 'zip', 'exe');   <span>//</span><span> 类型白名单，过滤不允许上传的文件类型</span>
    <span>$max_size</span> = 1000000;  <span>//</span><span> 大小限制 为1M</span>
    <span>$upload_path</span> = 'D:/WAMP';    <span>//</span><span> 指定移至的目录
     
    // 1、判断是否成功上传到服务器 </span>
    <span>$error</span> = <span>$_FILES</span>['uploadFile']['error'<span>];
    </span><span>if</span>(<span>$error</span> > 0<span>){
         </span><span>switch</span>(<span>$error</span><span>){
             </span><span>case</span> 1: <span>exit</span>('超过php配置的最大文件上传限制'<span>);
             </span><span>case</span> 2: <span>exit</span>('超过HTML表单的最大文件上传限制'<span>);
             </span><span>case</span> 3: <span>exit</span>('文件只有部分被上传'<span>);
             </span><span>case</span> 4: <span>exit</span>('没有上传任何文件'<span>);
             </span><span>default</span>: <span>exit</span>('未知类型错误'<span>);
         }
    }
     
    </span><span>//</span><span> 2、判断是否为允许上传的类型</span>
    <span>$extension</span> = <span>pathinfo</span>(<span>$_FILES</span>['uploadFile']['name'], PATHINFO_EXTENSION); <span>//</span><span> 获取扩展名</span>
    <span>if</span>(!<span>in_array</span>(<span>$extension</span>, <span>$typeWhiteList</span><span>)){
        </span><span>if</span>(<span>$extension</span> == ''<span>)
           </span><span>exit</span>('不允许上传空类型文件'<span>);
         </span><span>else</span> 
           <span>exit</span>('不允许上传'.<span>$extension</span>.'类型文件'<span>);
    } 
     
    </span><span>//</span><span> 3、判断是否为允许大小</span>
    <span>if</span>(<span>$_FILES</span>['uploadFile']['size'] > <span>$max_size</span><span>){
        </span><span>exit</span>('超过了允许上传到的'.<span>$max_size</span>.'字节'<span>);
    }
     
    </span><span>//</span><span> 4、已到指定位置</span>
    <span>$filename</span> = <span>date</span>('Ymd').<span>rand</span>(1000, 9999);   <span>//</span><span> 生成一个新文件名，防止覆盖</span>
    <span>if</span>(<span>is_uploaded_file</span>(<span>$_FILES</span>['uploadFile']['tmp_name'])){   <span>//</span><span> 判断是否通过HTTP POST上传</span>
        <span>if</span>(!<span>move_uploaded_file</span>(<span>$_FILES</span>['uploadFile']['tmp_name'], <span>$upload_path</span>.<span>$filename</span>.'.'.<span>$extension</span><span>)){
            </span><span>exit</span>('无法移动到指定位置'<span>);
         }
         </span><span>else</span><span>{
            </span><span>echo</span> '文件上传成功<br/>'<span>;
            </span><span>echo</span> '文件名: '.<span>$upload_path</span>.<span>$filename</span>.'.'.<span>$extension</span>.'<br>'<span>;
         }
    }
     </span><span>else</span><span>{
         </span><span>exit</span>('文件未通过合法途径上传'<span>);
     }</span>