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Jul 13, 2016 am 10:21 AM

phpuploadaboutprincipleandoperatedocumentarticleyesSimple

PHP multi-file upload operation,

In the previous article, I talked about the principle of PHP file upload and the simple operation example is single file upload.

http://www.cnblogs.com/lichenwei/p/3879566.html

In fact, multiple file uploads and single file uploads are similar. The principles are the same, but there are some tricks in the code.

The first is the index.html upload form, but the file in the previous file upload form is changed to file[]

<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> xml:lang</span><span>="en"</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>upload files<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>="upload.php"</span><span> enctype</span><span>="multipart/form-data"</span><span> method</span><span>="post"</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>="100000"</span> <span>/></span><span>
        上传文件：</span><span><</span><span>input </span><span>type</span><span>="file"</span><span> name</span><span>="file[]"</span><span>/><</span><span>br</span><span>/></span><span>
        上传文件：</span><span><</span><span>input </span><span>type</span><span>="file"</span><span> name</span><span>="file[]"</span><span>/><</span><span>br</span><span>/></span><span>
        上传文件：</span><span><</span><span>input </span><span>type</span><span>="file"</span><span> name</span><span>="file[]"</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>

Use $_FILES in upload.php to print it

<?<span>php　　<br /></span><span>　　print_r</span>(<span>$_FILES</span>); <br />?>

Get the following multi-dimensional array

<span>Array</span><span>
(
    [</span><span>file</span>] => <span>Array</span><span>
        (
            [name] </span>=> <span>Array</span><span>
                (
                    [</span>0] => 照片1.<span>jpg
                    [</span>1] => 照片2.<span>jpg
                    [</span>2] => 照片3.<span>jpg
                )

            [type] </span>=> <span>Array</span><span>
                (
                    [</span>0] => image/<span>jpeg
                    [</span>1] => image/<span>jpeg
                    [</span>2] => image/<span>jpeg
                )

            [tmp_name] </span>=> <span>Array</span><span>
                (
                    [</span>0] => F:\wamp\tmp\php36C7.<span>tmp
                    [</span>1] => F:\wamp\tmp\php36C8.<span>tmp
                    [</span>2] => F:\wamp\tmp\php36C9.<span>tmp
                )

            [error] </span>=> <span>Array</span><span>
                (
                    [</span>0] => 0<span>
                    [</span>1] => 0<span>
                    [</span>2] => 0<span>
                )

            [size] </span>=> <span>Array</span><span>
                (
                    [</span>0] => 0<span>
                    [</span>1] => 0<span>
                    [</span>2] => 0<span>
                )

        )

)</span>

According to the principle of single file upload, first think about what we need to get?

Obviously we need to get an array of file information. The array contains name, type, tmp_name, error, size. What we get at this time is a multi-dimensional array. Although the corresponding key values exist, it is multi-dimensional. ,

We only need to split it, such as the three files above, we only need to split it into the corresponding three file information arrays.

Structure of split array

<span>Array</span><span>
(
    [</span>0] => <span>Array</span><span>
        (
            [name] </span>=> 照片1.<span>jpg
            [type] </span>=> image/<span>jpeg
            [tmp_name] </span>=> F:\wamp\tmp\php13C1.<span>tmp
            [error] </span>=> 0<span>
            [size] </span>=> 385150<span>
        )

    [</span>1] => <span>Array</span><span>
        (
            [name] </span>=> 照片2.<span>jpg
            [type] </span>=> image/<span>jpeg
            [tmp_name] </span>=> F:\wamp\tmp\php13D2.<span>tmp
            [error] </span>=> 0<span>
            [size] </span>=> 242043<span>
        )

    [</span>2] => <span>Array</span><span>
        (
            [name] </span>=> 照片3.<span>jpg
            [type] </span>=> image/<span>jpeg
            [tmp_name] </span>=> F:\wamp\tmp\php13D3.<span>tmp
            [error] </span>=> 0<span>
            [size] </span>=> 488293<span>
        )

)</span>

The following is the code for splitting and reorganizing the array

<?<span>php
    

    </span><span>//</span><span>print_r($_FILES['file']);</span>
    <span>$arr</span>=<span>$_FILES</span>['file'<span>];
    </span><span>$files</span>=<span>array</span><span>();
    </span><span>for</span>(<span>$i</span>=0;<span>$i</span><<span>count</span>(<span>$arr</span>['name']);<span>$i</span>++<span>){
        </span><span>$files</span>[<span>$i</span>]['name']=<span>$arr</span>['name'][<span>$i</span><span>];
        </span><span>$files</span>[<span>$i</span>]['type']=<span>$arr</span>['type'][<span>$i</span><span>];
        </span><span>$files</span>[<span>$i</span>]['tmp_name']=<span>$arr</span>['tmp_name'][<span>$i</span><span>];
        </span><span>$files</span>[<span>$i</span>]['error']=<span>$arr</span>['error'][<span>$i</span><span>];
        </span><span>$files</span>[<span>$i</span>]['size']=<span>$arr</span>['size'][<span>$i</span><span>];
    }

    </span><span>print_r</span>(<span>$files</span>);<br />?>

The rest is simple. Just repeat the steps of uploading a single file and iterate through the array.

The code is as follows:

<?<span>php
    

    </span><span>//</span><span>print_r($_FILES['file']);</span>
    <span>$arr</span>=<span>$_FILES</span>['file'<span>];
    </span><span>$files</span>=<span>array</span><span>();
    </span><span>for</span>(<span>$i</span>=0;<span>$i</span><<span>count</span>(<span>$arr</span>['name']);<span>$i</span>++){<span>//</span><span>count()统计数组键值name长度</span>
        <span>$files</span>[<span>$i</span>]['name']=<span>$arr</span>['name'][<span>$i</span><span>];
        </span><span>$files</span>[<span>$i</span>]['type']=<span>$arr</span>['type'][<span>$i</span><span>];
        </span><span>$files</span>[<span>$i</span>]['tmp_name']=<span>$arr</span>['tmp_name'][<span>$i</span><span>];
        </span><span>$files</span>[<span>$i</span>]['error']=<span>$arr</span>['error'][<span>$i</span><span>];
        </span><span>$files</span>[<span>$i</span>]['size']=<span>$arr</span>['size'][<span>$i</span><span>];
    }

    </span><span>for</span>(<span>$i</span>=0;<span>$i</span><<span>count</span>(<span>$files</span>);<span>$i</span>++<span>){
    </span><span>//</span><span>取得上传文件信息</span>
    <span>$fileName</span>=<span>$files</span>[<span>$i</span>]['name'<span>];
    </span><span>$fileType</span>=<span>$files</span>[<span>$i</span>]['type'<span>];
    </span><span>$fileError</span>=<span>$files</span>[<span>$i</span>]['type'<span>];
    </span><span>$fileSize</span>=<span>$files</span>[<span>$i</span>]['size'<span>];
    </span><span>$tempName</span>=<span>$files</span>[<span>$i</span>]['tmp_name'];<span>//</span><span>临时文件名
    
    //定义上传文件类型</span>
    <span>$typeList</span> = <span>array</span>("image/jpeg","image/jpg","image/png","image/gif"); <span>//</span><span>定义允许的类型</span>

    <span>if</span>(<span>$fileError</span>>0<span>){
            </span><span>//</span><span>上传文件错误编号判断</span>
            <span>switch</span> (<span>$fileError</span><span>) {
                </span><span>case</span> 1:
                    <span>$message</span>="上传的文件超过了php.ini 中 upload_max_filesize 选项限制的值。"<span>; 
                    </span><span>break</span><span>;
                </span><span>case</span> 2:
                    <span>$message</span>="上传文件的大小超过了 HTML 表单中 MAX_FILE_SIZE 选项指定的值。"<span>; 
                    </span><span>break</span><span>;
                </span><span>case</span> 3:
                    <span>$message</span>="文件只有部分被上传。"<span>; 
                    </span><span>break</span><span>;
                </span><span>case</span> 4:
                    <span>$message</span>="没有文件被上传。"<span>;
                    </span><span>break</span><span>;
                </span><span>case</span> 6:
                    <span>$message</span>="找不到临时文件夹。"<span>; 
                    </span><span>break</span><span>;
                </span><span>case</span> 7:
                    <span>$message</span>="文件写入失败"<span>; 
                    </span><span>break</span><span>;
                </span><span>case</span> 8:
                    <span>$message</span>="由于PHP的扩展程序中断了文件上传"<span>;
                    </span><span>break</span><span>;
            }

            </span><span>exit</span>("文件上传失败：".<span>$message</span><span>);

        }
    </span><span>if</span>(!<span>is_uploaded_file</span>(<span>$tempName</span><span>)){
        </span><span>//</span><span>判断是否是POST上传过来的文件</span>
        <span>exit</span>("不是通过HTTP POST方式上传上来的"<span>);
    }</span><span>else</span><span>{
        </span><span>if</span>(!<span>in_array</span>(<span>$fileType</span>, <span>$typeList</span><span>)){
            </span><span>exit</span>("上传的文件不是指定类型"<span>);
        }</span><span>else</span><span>{
            </span><span>if</span>(!<span>getimagesize</span>(<span>$tempName</span><span>)){
                </span><span>//</span><span>避免用户上传恶意文件,如把病毒文件扩展名改为图片格式</span>
                <span>exit</span>("上传的文件不是图片"<span>);
            }
        }
            </span><span>if</span>(<span>$fileSize</span>>1000000<span>){
                </span><span>//</span><span>对特定表单的上传文件限制大小</span>
                <span>exit</span>("上传文件超出限制大小"<span>);
            }</span><span>else</span><span>{
                </span><span>//</span><span>避免上传文件的中文名乱码</span>
                <span>$fileName</span>=<span>iconv</span>("UTF-8", "GBK", <span>$fileName</span>);<span>//</span><span>把iconv抓取到的字符编码从utf-8转为gbk输出</span>
                <span>$fileName</span>=<span>str_replace</span>(".", <span>time</span>().".", <span>$fileName</span>);<span>//</span><span>在图片名称后加入时间戳，避免重名文件覆盖</span>
                <span>if</span>(<span>move_uploaded_file</span>(<span>$tempName</span>, "uploads/".<span>$fileName</span><span>)){
                    </span><span>echo</span> "上传文件成功！"<span>;
                }</span><span>else</span><span>{
                    </span><span>echo</span> "上传文件失败"<span>;
                }
            }

        }

    }
</span>?>

The effect is as follows:

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