PHP实现文件上传下载——心在忙而已，

　　这一周都没有写什么东西，是啊，一周时间都没有学习太多新的东西，除了开车。

妈蛋啊，天天中午去学车然后两周没有午觉的日子还是很崩溃的，加上之后工作压力带来的心忙，宝宝不开心啊。

不过，也是自己不是那么能吃苦吧。那天看到的那句话怎么说的来着，我痛恨自己，在简单和困难之前，选择了前者；在什么什么面前，balabala，不是很鸡汤，但有点触动，愿少点矫情和娇气。

PHP实现文件上传与下载——来自mooc网

一、上传原理与配置

1.1 原理

将客户端文件上传到服务器端，再将服务器端的文件（临时文件）移动到指定目录即可。

1.2 客户端配置

所需：表单页面（选择上传文件）；

具体而言：发送方式为POST，添加enctype="multipart/form-data"属性，两者缺一不可（但是，优缺点并存，这里也限定了上传的方式和上传的文件之后的调用等方面，后面会说到）

<span><!</span><span>DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"</span><span>></span>
<span><</span><span>html</span><span>></span>
<span><</span><span>head</span><span>></span>
<span><</span><span>meta </span><span>http-equiv</span><span>="Content-Type"</span><span> content</span><span>="text/html; charset=UTF-8"</span><span>></span>
<span><</span><span>title</span><span>></span>Insert title here<span></</span><span>title</span><span>></span>
<span></</span><span>head</span><span>></span>
<span><</span><span>body</span><span>></span>
<span><</span><span>form </span><span>action</span><span>="doAction.php"</span><span> method</span><span>="post"</span><span> enctype</span><span>="multipart/form-data"</span><span>></span><span>
请选择您要上传的文件：
</span><span><</span><span>input </span><span>type</span><span>="file"</span><span> name</span><span>="myFile"</span> <span>/><</span><span>br</span><span>/></span>
<span><</span><span>input </span><span>type</span><span>="submit"</span><span> value</span><span>="上传"</span><span>/></span>
<span></</span><span>form</span><span>></span>
<span><?</span><span>php

</span><span>?></span>
<span></</span><span>body</span><span>></span>
<span></</span><span>html</span><span>></span>

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先是表单页面（请自动忽略前端问题。。。），关键就是form的属性；另外就是input 中用到了type="file"这一点（体现到php的强大的拓展等等）。

然后是doAction

<?<span>php
</span><span>//</span><span>$_FILES:文件上传变量
//print_r($_FILES);</span>
<span>$filename</span>=<span>$_FILES</span>['myFile']['name'<span>];
</span><span>$type</span>=<span>$_FILES</span>['myFile']['type'<span>];
</span><span>$tmp_name</span>=<span>$_FILES</span>['myFile']['tmp_name'<span>];
</span><span>$size</span>=<span>$_FILES</span>['myFile']['size'<span>];
</span><span>$error</span>=<span>$_FILES</span>['myFile']['error'<span>];

</span><span>//</span><span>将服务器上的临时文件移动到指定位置
//方法一move_upload_file($tmp_name,$destination)
//move_uploaded_file($tmp_name, "uploads/".$filename);//文件夹应提前建立好，不然报错
//方法二copy($src,$des)
//以上两个函数都是成功返回真，否则返回false
//copy($tmp_name, "copies/".$filename);
//注意，不能两个方法都对临时文件进行操作，临时文件似乎操作完就没了，我们试试反过来</span>
<span>copy</span>(<span>$tmp_name</span>, "copies/".<span>$filename</span><span>);
</span><span>move_uploaded_file</span>(<span>$tmp_name</span>, "uploads/".<span>$filename</span><span>);
</span><span>//</span><span>能够实现，说明move那个函数基本上相当于剪切；copy就是copy，临时文件还在

//另外，错误信息也是不一样的，遇到错误可以查看或者直接报告给用户</span>
<span>if</span> (<span>$error</span>==0<span>) {
    </span><span>echo</span> "上传成功！"<span>;
}</span><span>else</span><span>{
    </span><span>switch</span> (<span>$error</span><span>){
        </span><span>case</span> 1:
            <span>echo</span> "超过了上传文件的最大值，请上传2M以下文件"<span>;
            </span><span>break</span><span>;
        </span><span>case</span> 2:
            <span>echo</span> "上传文件过多，请一次上传20个及以下文件！"<span>;
            </span><span>break</span><span>;
        </span><span>case</span> 3:
            <span>echo</span> "文件并未完全上传，请再次尝试！"<span>;
            </span><span>break</span><span>;
        </span><span>case</span> 4:
            <span>echo</span> "未选择上传文件！"<span>;
            </span><span>break</span><span>;
        </span><span>case</span> 5:
            <span>echo</span> "上传文件为0"<span>;
            </span><span>break</span><span>;
    }
}</span>

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先把print_r($_FILES)这个信息看一下

<span>Array
(
    [myFile] => Array
        (
            [name] => 梁博_简历.doc
            [type] => application/msword
            [tmp_name] => D:\wamp\tmp\php1D78.tmp
            [error] => 0
            [size] => 75776
        )

)</span>

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所以得到的是个二维数组，该怎么用，都是基本的东西（其实我喜欢降维再用）；

基本是一眼就懂的东西，不罗嗦，关键有两个：tmp_name临时文件名；error报错信息（代号，后面可以利用）；

然后这里看一下doAction后面一部分，利用报错信息来反馈给用户，需要说明的是为什么报错，和报错信息是什么都；

1.3 关于报错

--报错原因

基本上都是超过或者不符合服务器关于上传文件的配置，那么服务器端配置有哪些呢？

先考虑上传我们用了什么？POST，upload

所以在php.ini中找这么几项：

file_upload:On

upload_tmp_dir=——临时文件保存目录；

upload_max_filesize=2M

max_file_uploads=20——允许一次上传的最大文件数量（注意和上面那个的区别，有没有size，别乱想）

post_max_size=8M——post方式发送数据的最大值

其他相关配置

max_exectuion_time=-1——最大执行时间，避免程序不好占用服务器资源；

max_input_time=60

max_input_nesting_level=64——输入嵌套深度；

memory_limit=128M——最大单线程的独立内存使用量

总之都是有关资源的配置。

--错误号

以下（偷懒）引自http://blog.sina.com.cn/s/blog_3cdfaea201008utf.html

UPLOAD_ERR_OK 值：0; 没有错误发生，文件上传成功。
UPLOAD_ERR_INI_SIZE 值：1; 上传的文件超过了 php.ini 中 upload_max_filesize 选项限制的值。
UPLOAD_ERR_FORM_SIZE 值：2; 上传文件的大小超过了 HTML 表单中 MAX_FILE_SIZE 选项指定的值。
UPLOAD_ERR_PARTIAL 值：3; 文件只有部分被上传。
UPLOAD_ERR_NO_FILE 值：4; 没有文件被上传。

注意：这个错误信息是第一步上传的信息，也就是上传到临时文件夹的情况，而不是move或者copy的情况。

二、上传相关限制

2.1 客户端限制

<span><</span><span>form </span><span>action</span><span>="doAction2.php"</span><span> method</span><span>="post"</span><span> enctype</span><span>="multipart/form-data"</span><span>></span>
<span><</span><span>input </span><span>type</span><span>="hidden"</span><span> name</span><span>="MAX_FILE_SIZE"</span><span> value</span><span>="101321"</span> <span>/></span><span>
请选择您要上传的文件：
</span><span><</span><span>input </span><span>type</span><span>="file"</span><span> name</span><span>="myFile"</span><span> accept</span><span>="image/jpeg,image/gif,text/html"</span><span>/><</span><span>br</span><span>/></span>
<span><</span><span>input </span><span>type</span><span>="submit"</span><span> value</span><span>="上传"</span><span>/></span>
<span></</span><span>form</span><span>></span>

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这里用input的属性对上传文件的大小和类型进行了限制，但是个人感觉：一，html代码是“可见的”；二，常不起作用（没找到原因，但因为第一个我也想放弃它，知道就好。

2.2 服务器端限制

主要限制大小和类型，再有就是方式。

<?<span>php
</span><span>header</span>('content-type:text/html;charset=utf-8'<span>);
</span><span>//</span><span>接受文件，临时文件信息</span>
<span>$fileinfo</span>=<span>$_FILES</span>["myFile"];<span>//</span><span>降维操作</span>
<span>$filename</span>=<span>$fileinfo</span>["name"<span>];
</span><span>$tmp_name</span>=<span>$fileinfo</span>["tmp_name"<span>];
</span><span>$size</span>=<span>$fileinfo</span>["size"<span>];
</span><span>$error</span>=<span>$fileinfo</span>["error"<span>];
</span><span>$type</span>=<span>$fileinfo</span>["type"<span>];

</span><span>//</span><span>服务器端设定限制</span>
<span>$maxsize</span>=10485760;<span>//</span><span>10M,10*1024*1024</span>
<span>$allowExt</span>=<span>array</span>('jpeg','jpg','png','tif');<span>//</span><span>允许上传的文件类型（拓展名</span>
<span>$ext</span>=<span>pathinfo</span>(<span>$filename</span>,PATHINFO_EXTENSION);<span>//</span><span>提取上传文件的拓展名

//目的信息</span>
<span>$path</span>="uploads"<span>;
</span><span>if</span> (!<span>file_exists</span>(<span>$path</span>)) {   <span>//</span><span>当目录不存在，就创建目录</span>
    <span>mkdir</span>(<span>$path</span>,0777,<span>true</span><span>);
    </span><span>chmod</span>(<span>$path</span>, 0777<span>);
}
</span><span>//</span><span>$destination=$path."/".$filename;
//得到唯一的文件名！防止因为文件名相同而产生覆盖</span>
<span>$uniName</span>=<span>md5</span>(<span>uniqid</span>(<span>microtime</span>(<span>true</span>),<span>true</span>)).<span>$ext</span>;<span>//</span><span>md5加密，uniqid产生唯一id，microtime做前缀</span>


<span>if</span> (<span>$error</span>==0<span>) {
    </span><span>if</span> (<span>$size</span>><span>$maxsize</span><span>) {
        </span><span>exit</span>("上传文件过大！"<span>);
    }
    </span><span>if</span> (!<span>in_array</span>(<span>$ext</span>, <span>$allowExt</span><span>)) {
        </span><span>exit</span>("非法文件类型"<span>);
    }
    </span><span>if</span> (!<span>is_uploaded_file</span>(<span>$tmp_name</span><span>)) {
        </span><span>exit</span>("上传方式有误，请使用post方式"<span>);
    }
    </span><span>if</span> (@<span>move_uploaded_file</span>(<span>$tmp_name</span>, <span>$uniName</span>)) {<span>//</span><span>@错误抑制符，不让用户看到警告</span>
        <span>echo</span> "文件".<span>$filename</span>."上传成功!"<span>;
    }</span><span>else</span><span>{
        </span><span>echo</span> "文件".<span>$filename</span>."上传失败!"<span>;
    }
    </span><span>//</span><span>判断是否为真实图片（防止伪装成图片的病毒一类的</span>
    <span>if</span> (!<span>getimagesize</span>(<span>$tmp_name</span>)) {<span>//</span><span>getimagesize真实返回数组，否则返回false</span>
        <span>exit</span>("不是真正的图片类型"<span>);
    }

}</span><span>else</span><span>{
    </span><span>switch</span> (<span>$error</span><span>){
        </span><span>case</span> 1:
            <span>echo</span> "超过了上传文件的最大值，请上传2M以下文件"<span>;
            </span><span>break</span><span>;
        </span><span>case</span> 2:
            <span>echo</span> "上传文件过多，请一次上传20个及以下文件！"<span>;
            </span><span>break</span><span>;
        </span><span>case</span> 3:
            <span>echo</span> "文件并未完全上传，请再次尝试！"<span>;
            </span><span>break</span><span>;
        </span><span>case</span> 4:
            <span>echo</span> "未选择上传文件！"<span>;
            </span><span>break</span><span>;
        </span><span>case</span> 7:
            <span>echo</span> "没有临时文件夹"<span>;
            </span><span>break</span><span>;
    }
}</span>

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这里，具体实现都有注释，每一步其实都可以自己试试的，很有趣。

2.3 封装

函数

<?<span>php
</span><span>function</span> uploadFile(<span>$fileInfo</span>,<span>$path</span>,<span>$allowExt</span>,<span>$maxSize</span><span>){

</span><span>$filename</span>=<span>$fileInfo</span>["name"<span>];
</span><span>$tmp_name</span>=<span>$fileInfo</span>["tmp_name"<span>];
</span><span>$size</span>=<span>$fileInfo</span>["size"<span>];
</span><span>$error</span>=<span>$fileInfo</span>["error"<span>];
</span><span>$type</span>=<span>$fileInfo</span>["type"<span>];

</span><span>//</span><span>服务器端设定限制</span>

<span>$ext</span>=<span>pathinfo</span>(<span>$filename</span>,<span>PATHINFO_EXTENSION);

</span><span>//</span><span>目的信息</span>
<span>if</span> (!<span>file_exists</span>(<span>$path</span><span>)) {   
    </span><span>mkdir</span>(<span>$path</span>,0777,<span>true</span><span>);
    </span><span>chmod</span>(<span>$path</span>, 0777<span>);
}
</span><span>$uniName</span>=<span>md5</span>(<span>uniqid</span>(<span>microtime</span>(<span>true</span>),<span>true</span>)).'.'.<span>$ext</span><span>;
</span><span>$destination</span>=<span>$path</span>."/".<span>$uniName</span><span>;


</span><span>if</span> (<span>$error</span>==0<span>) {
    </span><span>if</span> (<span>$size</span>><span>$maxSize</span><span>) {
        </span><span>exit</span>("上传文件过大！"<span>);
    }
    </span><span>if</span> (!<span>in_array</span>(<span>$ext</span>, <span>$allowExt</span><span>)) {
        </span><span>exit</span>("非法文件类型"<span>);
    }
    </span><span>if</span> (!<span>is_uploaded_file</span>(<span>$tmp_name</span><span>)) {
        </span><span>exit</span>("上传方式有误，请使用post方式"<span>);
    }
    </span><span>//</span><span>判断是否为真实图片（防止伪装成图片的病毒一类的</span>
    <span>if</span> (!<span>getimagesize</span>(<span>$tmp_name</span>)) {<span>//</span><span>getimagesize真实返回数组，否则返回false</span>
        <span>exit</span>("不是真正的图片类型"<span>);
    }
    </span><span>if</span> (@<span>move_uploaded_file</span>(<span>$tmp_name</span>, <span>$destination</span>)) {<span>//</span><span>@错误抑制符，不让用户看到警告</span>
        <span>echo</span> "文件".<span>$filename</span>."上传成功!"<span>;
    }</span><span>else</span><span>{
        </span><span>echo</span> "文件".<span>$filename</span>."上传失败!"<span>;
    }
    

}</span><span>else</span><span>{
    </span><span>switch</span> (<span>$error</span><span>){
        </span><span>case</span> 1:
            <span>echo</span> "超过了上传文件的最大值，请上传2M以下文件"<span>;
            </span><span>break</span><span>;
        </span><span>case</span> 2:
            <span>echo</span> "上传文件过多，请一次上传20个及以下文件！"<span>;
            </span><span>break</span><span>;
        </span><span>case</span> 3:
            <span>echo</span> "文件并未完全上传，请再次尝试！"<span>;
            </span><span>break</span><span>;
        </span><span>case</span> 4:
            <span>echo</span> "未选择上传文件！"<span>;
            </span><span>break</span><span>;
        </span><span>case</span> 7:
            <span>echo</span> "没有临时文件夹"<span>;
            </span><span>break</span><span>;
    }
}
</span><span>return</span> <span>$destination</span><span>;
}</span>

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调用

<?<span>php
</span><span>header</span>('content-type:text/html;charset=utf-8'<span>);
</span><span>$fileInfo</span>=<span>$_FILES</span>["myFile"<span>];
</span><span>$maxSize</span>=10485760;<span>//</span><span>10M,10*1024*1024</span>
<span>$allowExt</span>=<span>array</span>('jpeg','jpg','png','tif'<span>);
</span><span>$path</span>="uploads"<span>;
</span><span>include_once</span> 'upFunc.php'<span>;
uploadFile(</span><span>$fileInfo</span>, <span>$path</span>, <span>$allowExt</span>, <span>$maxSize</span>);

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三、多文件的上传实现

3.1 利用单文件封装

<span><!</span><span>DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"</span><span>></span>
<span><</span><span>html</span><span>></span>
<span><</span><span>head</span><span>></span>
<span><</span><span>meta </span><span>http-equiv</span><span>="Content-Type"</span><span> content</span><span>="text/html; charset=UTF-8"</span><span>></span>
<span><</span><span>title</span><span>></span>Insert title here<span></</span><span>title</span><span>></span>
<span></</span><span>head</span><span>></span>
<span><</span><span>body</span><span>></span>
<span><</span><span>form </span><span>action</span><span>="doAction5.php"</span><span> method</span><span>="post"</span><span> enctype</span><span>="multipart/form-data"</span><span>></span><span>
请选择您要上传的文件：</span><span><</span><span>input </span><span>type</span><span>="file"</span><span> name</span><span>="myFile1"</span> <span>/><</span><span>br</span><span>/></span><span>
请选择您要上传的文件：</span><span><</span><span>input </span><span>type</span><span>="file"</span><span> name</span><span>="myFile2"</span> <span>/><</span><span>br</span><span>/></span><span>
请选择您要上传的文件：</span><span><</span><span>input </span><span>type</span><span>="file"</span><span> name</span><span>="myFile3"</span> <span>/><</span><span>br</span><span>/></span><span>
请选择您要上传的文件：</span><span><</span><span>input </span><span>type</span><span>="file"</span><span> name</span><span>="myFile4"</span> <span>/><</span><span>br</span><span>/></span>
<span><</span><span>input </span><span>type</span><span>="submit"</span><span> value</span><span>="上传"</span><span>/></span>
<span></</span><span>form</span><span>></span>
<span></</span><span>body</span><span>></span>
<span></</span><span>html</span><span>></span>

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<?<span>php
</span><span>//</span><span>print_r($_FILES);</span>
<span>header</span>('content-type:text/html;charset=utf-8'<span>);
</span><span>include_once</span> 'upFunc.php'<span>;
</span><span>foreach</span> (<span>$_FILES</span> <span>as</span> <span>$fileInfo</span><span>){
    </span><span>$file</span>[]=uploadFile(<span>$fileInfo</span><span>);
}</span>

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这里的思路，从print_r($_FILES)中去找，打印出来看到是个二维数组，很简单，遍历去用就好了！

上面那个function的定义改一下，给定一些默认值

<span>function</span> uploadFile(<span>$fileInfo</span>,<span>$path</span>="uploads",<span>$allowExt</span>=<span>array</span>('jpeg','jpg','png','tif'),<span>$maxSize</span>=10485760){

Salin selepas log masuk

这样子，简单是简单，但遇到一些问题。

正常的上传4个图片是没问题，但要是中间激活了函数中的exit，就会立即停止，导致其他图片也无法上传。

3.2 升级版封装

旨在实现针对多个或单个文件上传的封装

首先这样子写个静态文件

<span><!</span><span>DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"</span><span>></span>
<span><</span><span>html</span><span>></span>
<span><</span><span>head</span><span>></span>
<span><</span><span>meta </span><span>http-equiv</span><span>="Content-Type"</span><span> content</span><span>="text/html; charset=UTF-8"</span><span>></span>
<span><</span><span>title</span><span>></span>Insert title here<span></</span><span>title</span><span>></span>
<span></</span><span>head</span><span>></span>
<span><</span><span>body</span><span>></span>
<span><</span><span>form </span><span>action</span><span>="doAction5.php"</span><span> method</span><span>="post"</span><span> enctype</span><span>="multipart/form-data"</span><span>></span><span>
请选择您要上传的文件：</span><span><</span><span>input </span><span>type</span><span>="file"</span><span> name</span><span>="myFile[]"</span> <span>/><</span><span>br</span><span>/></span><span>
请选择您要上传的文件：</span><span><</span><span>input </span><span>type</span><span>="file"</span><span> name</span><span>="myFile[]"</span> <span>/><</span><span>br</span><span>/></span><span>
请选择您要上传的文件：</span><span><</span><span>input </span><span>type</span><span>="file"</span><span> name</span><span>="myFile[]"</span> <span>/><</span><span>br</span><span>/></span><span>
请选择您要上传的文件：</span><span><</span><span>input </span><span>type</span><span>="file"</span><span> name</span><span>="myFile[]"</span> <span>/><</span><span>br</span><span>/></span>
<span><</span><span>input </span><span>type</span><span>="submit"</span><span> value</span><span>="上传"</span><span>/></span>
<span></</span><span>form</span><span>></span>
<span></</span><span>body</span><span>></span>
<span></</span><span>html</span><span>></span>

Salin selepas log masuk

打印一下$_FILES

<span>Array
(
    [myFile] => Array
        (
            [name] => Array
                (
                    [0] => test32.png
                    [1] => test32.png
                    [2] => 333.png
                    [3] => test41.png
                )

            [type] => Array
                (
                    [0] => image/png
                    [1] => image/png
                    [2] => image/png
                    [3] => image/png
                )

            [tmp_name] => Array
                (
                    [0] => D:\wamp\tmp\php831C.tmp
                    [1] => D:\wamp\tmp\php834C.tmp
                    [2] => D:\wamp\tmp\php837C.tmp
                    [3] => D:\wamp\tmp\php83BB.tmp
                )

            [error] => Array
                (
                    [0] => 0
                    [1] => 0
                    [2] => 0
                    [3] => 0
                )

            [size] => Array
                (
                    [0] => 46174
                    [1] => 46174
                    [2] => 34196
                    [3] => 38514
                )

        )

)</span>

Salin selepas log masuk

可以得到一个三维数组。

复杂是复杂了，但复杂的有规律，各项数值都在一起了，很方便我们取值！！

所以先得到文件信息，变成单文件处理那种信息

<span>function</span><span> getFiles(){
    </span><span>$i</span>=0<span>;
    </span><span>foreach</span>(<span>$_FILES</span> <span>as</span> <span>$file</span><span>){
        </span><span>if</span>(<span>is_string</span>(<span>$file</span>['name'])){  <span>//</span><span>单文件判定</span>
            <span>$files</span>[<span>$i</span>]=<span>$file</span><span>;
            </span><span>$i</span>++<span>;
        }</span><span>elseif</span>(<span>is_array</span>(<span>$file</span>['name'<span>])){
            </span><span>foreach</span>(<span>$file</span>['name'] <span>as</span> <span>$key</span>=><span>$val</span>){  <span>//</span><span>我的天，这个$key用的diao</span>
                <span>$files</span>[<span>$i</span>]['name']=<span>$file</span>['name'][<span>$key</span><span>];
                </span><span>$files</span>[<span>$i</span>]['type']=<span>$file</span>['type'][<span>$key</span><span>];
                </span><span>$files</span>[<span>$i</span>]['tmp_name']=<span>$file</span>['tmp_name'][<span>$key</span><span>];
                </span><span>$files</span>[<span>$i</span>]['error']=<span>$file</span>['error'][<span>$key</span><span>];
                </span><span>$files</span>[<span>$i</span>]['size']=<span>$file</span>['size'][<span>$key</span><span>];
                </span><span>$i</span>++<span>;
            }
        }
    }
    </span><span>return</span> <span>$files</span><span>;
    
}</span>

Salin selepas log masuk

然后之前的那种exit错误，就把exit改一下就好了，这里用res

<span>function</span> uploadFile(<span>$fileInfo</span>,<span>$path</span>='./uploads',<span>$flag</span>=<span>true</span>,<span>$maxSize</span>=1048576,<span>$allowExt</span>=<span>array</span>('jpeg','jpg','png','gif'<span>)){
    </span><span>//</span><span>$flag=true;
    //$allowExt=array('jpeg','jpg','gif','png');
    //$maxSize=1048576;//1M
    //判断错误号</span>
    <span>$res</span>=<span>array</span><span>();
    </span><span>if</span>(<span>$fileInfo</span>['error']===<span>UPLOAD_ERR_OK){
        </span><span>//</span><span>检测上传得到小</span>
        <span>if</span>(<span>$fileInfo</span>['size']><span>$maxSize</span><span>){
            </span><span>$res</span>['mes']=<span>$fileInfo</span>['name'].'上传文件过大'<span>;
        }
        </span><span>$ext</span>=getExt(<span>$fileInfo</span>['name'<span>]);
        </span><span>//</span><span>检测上传文件的文件类型</span>
        <span>if</span>(!<span>in_array</span>(<span>$ext</span>,<span>$allowExt</span><span>)){
            </span><span>$res</span>['mes']=<span>$fileInfo</span>['name'].'非法文件类型'<span>;
        }
        </span><span>//</span><span>检测是否是真实的图片类型</span>
        <span>if</span>(<span>$flag</span><span>){
            </span><span>if</span>(!<span>getimagesize</span>(<span>$fileInfo</span>['tmp_name'<span>])){
                </span><span>$res</span>['mes']=<span>$fileInfo</span>['name'].'不是真实图片类型'<span>;
            }
        }
        </span><span>//</span><span>检测文件是否是通过HTTP POST上传上来的</span>
        <span>if</span>(!<span>is_uploaded_file</span>(<span>$fileInfo</span>['tmp_name'<span>])){
            </span><span>$res</span>['mes']=<span>$fileInfo</span>['name'].'文件不是通过HTTP POST方式上传上来的'<span>;
        }
        </span><span>if</span>(<span>$res</span>) <span>return</span> <span>$res</span><span>;
        </span><span>//</span><span>$path='./uploads';</span>
        <span>if</span>(!<span>file_exists</span>(<span>$path</span><span>)){
            </span><span>mkdir</span>(<span>$path</span>,0777,<span>true</span><span>);
            </span><span>chmod</span>(<span>$path</span>,0777<span>);
        }
        </span><span>$uniName</span>=<span>getUniName();
        </span><span>$destination</span>=<span>$path</span>.'/'.<span>$uniName</span>.'.'.<span>$ext</span><span>;
        </span><span>if</span>(!<span>move_uploaded_file</span>(<span>$fileInfo</span>['tmp_name'],<span>$destination</span><span>)){
            </span><span>$res</span>['mes']=<span>$fileInfo</span>['name'].'文件移动失败'<span>;
        }
        </span><span>$res</span>['mes']=<span>$fileInfo</span>['name'].'上传成功'<span>;
        </span><span>$res</span>['dest']=<span>$destination</span><span>;
        </span><span>return</span> <span>$res</span><span>;
        
    }</span><span>else</span><span>{
        </span><span>//</span><span>匹配错误信息</span>
        <span>switch</span> (<span>$fileInfo</span> ['error'<span>]) {
            </span><span>case</span> 1 :
                <span>$res</span>['mes'] = '上传文件超过了PHP配置文件中upload_max_filesize选项的值'<span>;
                </span><span>break</span><span>;
            </span><span>case</span> 2 :
                <span>$res</span>['mes'] = '超过了表单MAX_FILE_SIZE限制的大小'<span>;
                </span><span>break</span><span>;
            </span><span>case</span> 3 :
                <span>$res</span>['mes'] = '文件部分被上传'<span>;
                </span><span>break</span><span>;
            </span><span>case</span> 4 :
                <span>$res</span>['mes'] = '没有选择上传文件'<span>;
                </span><span>break</span><span>;
            </span><span>case</span> 6 :
                <span>$res</span>['mes'] = '没有找到临时目录'<span>;
                </span><span>break</span><span>;
            </span><span>case</span> 7 :
            <span>case</span> 8 :
                <span>$res</span>['mes'] = '系统错误'<span>;
                </span><span>break</span><span>;
        }
        </span><span>return</span> <span>$res</span><span>;
    }
}</span>

Salin selepas log masuk

里面封装了两个小的

<span>function</span> getExt(<span>$filename</span><span>){
    </span><span>return</span> <span>strtolower</span>(<span>pathinfo</span>(<span>$filename</span>,<span>PATHINFO_EXTENSION));
}

</span><span>/*</span><span>*
 * 产生唯一字符串
 * @return string
 </span><span>*/</span>
<span>function</span><span> getUniName(){
    </span><span>return</span> <span>md5</span>(<span>uniqid</span>(<span>microtime</span>(<span>true</span>),<span>true</span><span>));
}</span>

Salin selepas log masuk

然后静态中，用multiple属性实现多个文件的输入；

<span><!</span><span>DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"</span><span>></span>
<span><</span><span>html</span><span>></span>
<span><</span><span>head</span><span>></span>
<span><</span><span>meta </span><span>http-equiv</span><span>="Content-Type"</span><span> content</span><span>="text/html; charset=UTF-8"</span><span>></span>
<span><</span><span>title</span><span>></span>Insert title here<span></</span><span>title</span><span>></span>
<span></</span><span>head</span><span>></span>
<span><</span><span>body</span><span>></span>
<span><</span><span>form </span><span>action</span><span>="doAction6.php"</span><span> method</span><span>="POST"</span><span> enctype</span><span>="multipart/form-data"</span><span>></span><span>
请选择您要上传的文件：</span><span><</span><span>input </span><span>type</span><span>="file"</span><span> name</span><span>="myFile[]"</span><span> multiple</span><span>='multiple' </span><span>/><</span><span>br</span><span>/></span>
<span><</span><span>input </span><span>type</span><span>="submit"</span><span> value</span><span>="上传"</span><span>/></span>
<span></</span><span>form</span><span>></span>
<span></</span><span>body</span><span>></span>
<span></</span><span>html</span><span>></span>

Salin selepas log masuk

doAction6

<?<span>php 
</span><span>//</span><span>print_r($_FILES);</span>
<span>header</span>("content-type:text/html;charset=utf-8"<span>);
</span><span>require_once</span> 'upFunc2.php'<span>;
</span><span>require_once</span> 'common.func.php'<span>;
</span><span>$files</span>=<span>getFiles();
</span><span>//</span><span> print_r($files);</span>
<span>foreach</span>(<span>$files</span> <span>as</span> <span>$fileInfo</span><span>){
    </span><span>$res</span>=uploadFile(<span>$fileInfo</span><span>);
    </span><span>echo</span> <span>$res</span>['mes'],'<br/>'<span>;
    </span><span>$uploadFiles</span>[]=@<span>$res</span>['dest'<span>];
}
</span><span>$uploadFiles</span>=<span>array_values</span>(<span>array_filter</span>(<span>$uploadFiles</span><span>));
</span><span>//</span><span>print_r($uploadFiles);</span>

Salin selepas log masuk

这样子的几个文件，就实现比较强大的面向过程的上传文件的功能（学的叫一个心酸。。。）；

四、面向对象的文件上传

（不是很写的动了。。。先粘过来，再说吧。。。

<?<span>php 
</span><span>class</span><span> upload{
    </span><span>protected</span> <span>$fileName</span><span>;
    </span><span>protected</span> <span>$maxSize</span><span>;
    </span><span>protected</span> <span>$allowMime</span><span>;
    </span><span>protected</span> <span>$allowExt</span><span>;
    </span><span>protected</span> <span>$uploadPath</span><span>;
    </span><span>protected</span> <span>$imgFlag</span><span>;
    </span><span>protected</span> <span>$fileInfo</span><span>;
    </span><span>protected</span> <span>$error</span><span>;
    </span><span>protected</span> <span>$ext</span><span>;
    </span><span>/*</span><span>*
     * @param string $fileName
     * @param string $uploadPath
     * @param string $imgFlag
     * @param number $maxSize
     * @param array $allowExt
     * @param array $allowMime
     </span><span>*/</span>
    <span>public</span> <span>function</span> __construct(<span>$fileName</span>='myFile',<span>$uploadPath</span>='./uploads',<span>$imgFlag</span>=<span>true</span>,<span>$maxSize</span>=5242880,<span>$allowExt</span>=<span>array</span>('jpeg','jpg','png','gif'),<span>$allowMime</span>=<span>array</span>('image/jpeg','image/png','image/gif'<span>)){
        </span><span>$this</span>->fileName=<span>$fileName</span><span>;
        </span><span>$this</span>->maxSize=<span>$maxSize</span><span>;
        </span><span>$this</span>->allowMime=<span>$allowMime</span><span>;
        </span><span>$this</span>->allowExt=<span>$allowExt</span><span>;
        </span><span>$this</span>->uploadPath=<span>$uploadPath</span><span>;
        </span><span>$this</span>->imgFlag=<span>$imgFlag</span><span>;
        </span><span>$this</span>->fileInfo=<span>$_FILES</span>[<span>$this</span>-><span>fileName];
    }
    </span><span>/*</span><span>*
     * 检测上传文件是否出错
     * @return boolean
     </span><span>*/</span>
    <span>protected</span> <span>function</span><span> checkError(){
        </span><span>if</span>(!<span>is_null</span>(<span>$this</span>-><span>fileInfo)){
            </span><span>if</span>(<span>$this</span>->fileInfo['error']>0<span>){
                </span><span>switch</span>(<span>$this</span>->fileInfo['error'<span>]){
                    </span><span>case</span> 1:
                        <span>$this</span>->error='超过了PHP配置文件中upload_max_filesize选项的值'<span>;
                        </span><span>break</span><span>;
                    </span><span>case</span> 2:
                        <span>$this</span>->error='超过了表单中MAX_FILE_SIZE设置的值'<span>;
                        </span><span>break</span><span>;
                    </span><span>case</span> 3:
                        <span>$this</span>->error='文件部分被上传'<span>;
                        </span><span>break</span><span>;
                    </span><span>case</span> 4:
                        <span>$this</span>->error='没有选择上传文件'<span>;
                        </span><span>break</span><span>;
                    </span><span>case</span> 6:
                        <span>$this</span>->error='没有找到临时目录'<span>;
                        </span><span>break</span><span>;
                    </span><span>case</span> 7:
                        <span>$this</span>->error='文件不可写'<span>;
                        </span><span>break</span><span>;
                    </span><span>case</span> 8:
                        <span>$this</span>->error='由于PHP的扩展程序中断文件上传'<span>;
                        </span><span>break</span><span>;
                        
                }
                </span><span>return</span> <span>false</span><span>;
            }</span><span>else</span><span>{
                </span><span>return</span> <span>true</span><span>;
            }
        }</span><span>else</span><span>{
            </span><span>$this</span>->error='文件上传出错'<span>;
            </span><span>return</span> <span>false</span><span>;
        }
    }
    </span><span>/*</span><span>*
     * 检测上传文件的大小
     * @return boolean
     </span><span>*/</span>
    <span>protected</span> <span>function</span><span> checkSize(){
        </span><span>if</span>(<span>$this</span>->fileInfo['size']><span>$this</span>-><span>maxSize){
            </span><span>$this</span>->error='上传文件过大'<span>;
            </span><span>return</span> <span>false</span><span>;
        }
        </span><span>return</span> <span>true</span><span>;
    }
    </span><span>/*</span><span>*
     * 检测扩展名
     * @return boolean
     </span><span>*/</span>
    <span>protected</span> <span>function</span><span> checkExt(){
        </span><span>$this</span>->ext=<span>strtolower</span>(<span>pathinfo</span>(<span>$this</span>->fileInfo['name'],<span>PATHINFO_EXTENSION));
        </span><span>if</span>(!<span>in_array</span>(<span>$this</span>->ext,<span>$this</span>-><span>allowExt)){
            </span><span>$this</span>->error='不允许的扩展名'<span>;
            </span><span>return</span> <span>false</span><span>;
        }
        </span><span>return</span> <span>true</span><span>;
    }
    </span><span>/*</span><span>*
     * 检测文件的类型
     * @return boolean
     </span><span>*/</span>
    <span>protected</span> <span>function</span><span> checkMime(){
        </span><span>if</span>(!<span>in_array</span>(<span>$this</span>->fileInfo['type'],<span>$this</span>-><span>allowMime)){
            </span><span>$this</span>->error='不允许的文件类型'<span>;
            </span><span>return</span> <span>false</span><span>;
        }
        </span><span>return</span> <span>true</span><span>;
    }
    </span><span>/*</span><span>*
     * 检测是否是真实图片
     * @return boolean
     </span><span>*/</span>
    <span>protected</span> <span>function</span><span> checkTrueImg(){
        </span><span>if</span>(<span>$this</span>-><span>imgFlag){
            </span><span>if</span>(!@<span>getimagesize</span>(<span>$this</span>->fileInfo['tmp_name'<span>])){
                </span><span>$this</span>->error='不是真实图片'<span>;
                </span><span>return</span> <span>false</span><span>;
            }
            </span><span>return</span> <span>true</span><span>;
        }
    }
    </span><span>/*</span><span>*
     * 检测是否通过HTTP POST方式上传上来的
     * @return boolean
     </span><span>*/</span>
    <span>protected</span> <span>function</span><span> checkHTTPPost(){
        </span><span>if</span>(!<span>is_uploaded_file</span>(<span>$this</span>->fileInfo['tmp_name'<span>])){
            </span><span>$this</span>->error='文件不是通过HTTP POST方式上传上来的'<span>;
            </span><span>return</span> <span>false</span><span>;
        }
        </span><span>return</span> <span>true</span><span>;
    }
    </span><span>/*</span><span>*
     *显示错误 
     </span><span>*/</span>
    <span>protected</span> <span>function</span><span> showError(){
        </span><span>exit</span>('<span>$this</span>->error.'</span>'<span>);
    }
    </span><span>/*</span><span>*
     * 检测目录不存在则创建
     </span><span>*/</span>
    <span>protected</span> <span>function</span><span> checkUploadPath(){
        </span><span>if</span>(!<span>file_exists</span>(<span>$this</span>-><span>uploadPath)){
            </span><span>mkdir</span>(<span>$this</span>->uploadPath,0777,<span>true</span><span>);
        }
    }
    </span><span>/*</span><span>*
     * 产生唯一字符串
     * @return string
     </span><span>*/</span>
    <span>protected</span> <span>function</span><span> getUniName(){
        </span><span>return</span> <span>md5</span>(<span>uniqid</span>(<span>microtime</span>(<span>true</span>),<span>true</span><span>));
    }
    </span><span>/*</span><span>*
     * 上传文件
     * @return string
     </span><span>*/</span>
    <span>public</span> <span>function</span><span> uploadFile(){
        </span><span>if</span>(<span>$this</span>->checkError()&&<span>$this</span>->checkSize()&&<span>$this</span>->checkExt()&&<span>$this</span>->checkMime()&&<span>$this</span>->checkTrueImg()&&<span>$this</span>-><span>checkHTTPPost()){
            </span><span>$this</span>-><span>checkUploadPath();
            </span><span>$this</span>->uniName=<span>$this</span>-><span>getUniName();
            </span><span>$this</span>->destination=<span>$this</span>->uploadPath.'/'.<span>$this</span>->uniName.'.'.<span>$this</span>-><span>ext;
            </span><span>if</span>(@<span>move_uploaded_file</span>(<span>$this</span>->fileInfo['tmp_name'], <span>$this</span>-><span>destination)){
                </span><span>return</span>  <span>$this</span>-><span>destination;
            }</span><span>else</span><span>{
                </span><span>$this</span>->error='文件移动失败'<span>;
                </span><span>$this</span>-><span>showError();
            }
        }</span><span>else</span><span>{
            </span><span>$this</span>-><span>showError();
        }
    }
}</span>

Salin selepas log masuk

<?<span>php 
</span><span>header</span>('content-type:text/html;charset=utf-8'<span>);
</span><span>require_once</span> 'upload.class.php'<span>;
</span><span>$upload</span>=<span>new</span> upload('myFile1','imooc'<span>);
</span><span>$dest</span>=<span>$upload</span>-><span>uploadFile();
</span><span>echo</span> <span>$dest</span>;

Salin selepas log masuk

四、下载

对于浏览器不识别的，可以直接下载，但对于能识别的，需要多一两步

<span><!</span><span>DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"</span><span>></span>
<span><</span><span>html </span><span>xmlns</span><span>="http://www.w3.org/1999/xhtml"</span><span>></span>
<span><</span><span>head</span><span>></span>
<span><</span><span>meta </span><span>http-equiv</span><span>="Content-Type"</span><span> content</span><span>="text/html; charset=UTF-8"</span> <span>/></span>
<span><</span><span>title</span><span>></span>Insert title here<span></</span><span>title</span><span>></span>
<span></</span><span>head</span><span>></span>
<span><</span><span>body</span><span>></span>
<span><</span><span>a </span><span>href</span><span>="1.rar"</span><span>></span>下载1.rar<span></</span><span>a</span><span>></span>
<span><</span><span>br </span><span>/></span>
<span><</span><span>a </span><span>href</span><span>="1.jpg"</span><span>></span>下载1.jpg<span></</span><span>a</span><span>></span>
<span><</span><span>br </span><span>/></span>
<span><</span><span>a </span><span>href</span><span>="doDownload.php?filename=1.jpg"</span><span>></span>通过程序下载1.jpg<span></</span><span>a</span><span>></span>
<span><</span><span>br </span><span>/></span>
<span><</span><span>a </span><span>href</span><span>="doDownload.php?filename=../upload/nv.jpg"</span><span>></span>下载nv.jpg<span></</span><span>a</span><span>></span>
<span><?</span><span>php

</span><span>?></span>
<span></</span><span>body</span><span>></span>
<span></</span><span>html</span><span>></span>

Salin selepas log masuk

<?<span>php 
</span><span>$filename</span>=<span>$_GET</span>['filename'<span>];
</span><span>header</span>('content-disposition:attachment;filename='.<span>basename</span>(<span>$filename</span><span>));
</span><span>header</span>('content-length:'.<span>filesize</span>(<span>$filename</span><span>));
</span><span>readfile</span>(<span>$filename</span>);

Salin selepas log masuk

------------------总结-----------------------

<form action="doAction.php" method="post" enctype="multipart/form-data">

Salin selepas log masuk

二维数组的降维处理；

$_FILES变量

move_upload_file();copy();

tmp_name临时文件；

拓展名的提取；

真实图片的验证；

唯一文件名的生成；

函数封装以及调用；

利用单个文件函数实现多文件上传；

小功能的封装；

多文件的遍历；

面向对象的开发过程；

下载；

----------------------------------------

妈蛋啊。。。。。。。。。

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