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PHP implements file upload and download - just busy, _PHP tutorial

WBOY
Release： 2016-07-12 08:57:30
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PHP implements file upload and download - I am just busy,

I haven’t written anything this week, yes, I haven’t learned much new things in a week, except drive.

Damn it, going to learn to drive at noon every day and then not having a nap for two weeks is still very depressing. Coupled with the busyness caused by work pressure afterwards, the baby is not happy.

However, maybe I am not that able to endure hardship. What did the sentence I saw that day say? I hate myself for choosing the former between simplicity and difficulty; in front of everything, balabala is not very chicken soup, but it is a bit touching. I wish I would be less pretentious and squeamish.

PHP implements file upload and download - from mooc.com

1. Uploading principle and configuration

1.1 Principle

Upload the client files to the server , and then move the server-side files (temporary files) to the specified directory .

1.2 Client Configuration

Required: Form page (select upload file);

Specifically: The sending method is POST, add the enctype="multipart/form-data" attribute, both are indispensable (however, both advantages and disadvantages coexist, and the upload method and The calling of uploaded files, etc. will be discussed later) 

<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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First is the form page (please ignore the front-end issues automatically...), the key is the attribute of form; the other is type="file" is used in input (reflecting the powerful expansion of PHP etc).

Then 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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Let’s take a look at the information print_r($_FILES) first

<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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So what you get is a two-dimensional array. How to use it is all basic things (in fact, I like to reduce the dimension and then use it);

It’s basically something you can understand at a glance. It’s not verbose. There are two key points: tmp_name temporary file name; error error message (code name, you can use it later) ;

Then let’s take a look at the last part of doAction, which uses error information to feed back to the user. What needs to be explained is why the error is reported and what the error message is;

1.3 About error reporting

--Reason for the error

Basically, they exceed or do not comply with the server's configuration for uploading files. So what are the server-side configurations?

First consider uploading what we used? POST, upload

So look for these items in php.ini:

file_upload:On

upload_tmp_dir=——Temporary file storage directory;

upload_max_filesize=2M

max_file_uploads=20 - the maximum number of files allowed to be uploaded at one time (note the difference from the one above, don’t think about it if there is size or not)

post_max_size=8M - the maximum size of data sent in post mode

Other related configurations

max_exectuion_time=-1——maximum execution time to prevent the program from occupying server resources;

max_input_time=60

max_input_nesting_level=64——Input nesting depth;

memory_limit=128M——Maximum independent memory usage of a single thread

In short, it is all about the allocation of resources.

--error number

The following (lazy) quote is from http://blog.sina.com.cn/s/blog_3cdfaea201008utf.html

UPLOAD_ERR_OK Value: 0; No error occurred and the file was uploaded successfully.
UPLOAD_ERR_INI_SIZE Value: 1; The uploaded file exceeds upload_max_filesize in php.ini The value of the option limit.
UPLOAD_ERR_FORM_SIZE Value: 2; The size of the uploaded file exceeds the size of the HTML form MAX_FILE_SIZE The value specified by the option.
UPLOAD_ERR_PARTIAL Value: 3; Only part of the file was uploaded.
UPLOAD_ERR_NO_FILE Value: 4; No files were uploaded.

Note: This error message is the information uploaded in the first step, that is, uploaded to a temporary folder, not the case of move or copy.

2. Upload related restrictions

2.1 Client Limitations

<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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The input attribute is used here to limit the size and type of uploaded files, but my personal feeling is: first, the html code is "visible"; second, it often doesn't work (I haven't found the reason, but because of the first one I I also want to give it up, just know it.

2.2 Server-side restrictions

The main restrictions are size and type, and then there is the method. 

<?<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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Here, the specific implementation is commented. You can actually try every step by yourself, which is very interesting.

2.3 Packaging

Function

<?<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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Call

<?<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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3. Implementation of uploading multiple files

3.1 Using single file encapsulation

<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){
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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>
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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>
Copy after login

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>
Copy after login

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>
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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>
Copy after login

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>
Copy after login

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>
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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>
Copy after login

<?<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>;
Copy after login

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>
Copy after login

<?<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>);
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------------------总结-----------------------

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

 

 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。。。。。。。。。

 

www.bkjia.comtruehttp://www.bkjia.com/PHPjc/1108741.htmlTechArticlePHP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...
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