php file upload multiple file upload,

Before talking nonsense, let me first state that this article is based on mastering php single file upload, so I won’t go into details about file upload here. Server configuration and form settings should be paid attention to.

Not much to say, let’s get straight to the point. There are two ways to write a request page (only the form part is presented, taking uploading three files as an example.)

<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>
        請選擇我的上傳文件
        </span><span><</span><span>input </span><span>type</span><span>="file"</span><span> name</span><span>="myfile[]"</span><span>/></span>
        <span><</span><span>input </span><span>type</span><span>="file"</span><span> name</span><span>="myfile[]"</span> <span>/></span>
        <span><</span><span>input </span><span>type</span><span>="file"</span><span> name</span><span>="myfile[]"</span> <span>/></span>
        <span><</span><span>input </span><span>type</span><span>="submit"</span><span> value</span><span>="上傳"</span> <span>/></span>
<span></</span><span>form</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>
        請選擇我的上傳文件
        </span><span><</span><span>input </span><span>type</span><span>="file"</span><span> name</span><span>="myfil1"</span><span>/></span>
        <span><</span><span>input </span><span>type</span><span>="file"</span><span> name</span><span>="myfil2"</span><span>/></span>
        <span><</span><span>input </span><span>type</span><span>="file"</span><span> name</span><span>="myfil3"</span><span>/></span>
        <span><</span><span>input </span><span>type</span><span>="submit"</span><span> value</span><span>="上傳"</span> <span>/></span>
    <span></</span><span>form</span><span>></span>

Comparing the two, it is found that the only difference is the name. The first one sets the name in the form of an array, while the second one is a method that we can easily think of when setting it up.

Although there is only a little difference displayed on the surface, the $_FILES actually submitted to the doAction.php page is very different.

The first type of $_FILES is a three-dimensional array, while the second type is a two-dimensional array, as follows:

　function getFiles(){ foreach($_FILES as $file){ $fileNum=count($file['name']); if ($fileNum==1) { $files=$file; }else{ for ($i=0; $i < $fileNum; $i ) { $files[$i]['name']=$file['name'][$i]; $files[$i]['type']=$file['type'][$i]; $files[$i]['tmp_name']=$file['tmp_name'][$i]; $files[$i]['error']=$file['error'][$i]; $files[$i]['size']=$file['size'][$i]; } } } return $files; }

Through this function, $_FILES is converted into the following format:

At this moment, the two upload methods are on the same starting line. The next task is to write the uploadFile() function to upload each file, which is also the focus of this article.

File upload function:

<span>function</span> uploadFile(<span>$file</span>,<span>$path</span>='./uploads',<span>$max_size</span>,<span>$allowExt</span><span>){
　　</span><span>$filename</span>=<span>$file</span>['name'<span>];
    </span><span>$type</span>=<span>$file</span>['type'<span>];
    </span><span>$temp_name</span>=<span>$file</span>['tmp_name'<span>];
    </span><span>$error</span>=<span>$file</span>['error'<span>];
    </span><span>$size</span>=<span>$file</span>['size'<span>];


    </span><span>if</span> (<span>$error</span>==<span>UPLOAD_ERR_OK) {
        </span><span>if</span> (<span>$size</span>><span>$max_size</span><span>) {
            </span><span>$res</span>['mes']=<span>$filename</span>."文件超過規(guī)定上傳大小"<span>;
        }
        </span><span>$ext</span>=getExt(<span>$filename</span><span>);
        </span><span>if</span> (!<span>in_array</span>(<span>$ext</span>, <span>$allowExt</span><span>)) {
            </span><span>$res</span>['mes']=<span>$filename</span>.'文件名不合乎規(guī)范'<span>;
        }
        </span><span>if</span> (!<span>is_uploaded_file</span>(<span>$temp_name</span><span>)) {
            </span><span>$res</span>['mes']=<span>$filename</span>."文件不是通過HTTP POST 方法上傳上傳過來的"<span>;
        }


        </span><span>if</span> (@<span>$res</span><span>) {
            </span><span>return</span>  <span>$res</span><span>;
        }


        </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>$path</span>, 0777<span>);
        }
        </span><span>$fname</span>=<span>getUniName();


        </span><span>$destination</span>=<span>$path</span>.'/'.<span>$fname</span>.'.'.<span>$ext</span><span>;
        </span><span>if</span> (<span>move_uploaded_file</span>(<span>$temp_name</span>, <span>$destination</span><span>)) {
            </span><span>$res</span>['mes']=<span>$filename</span>.'上傳成功'<span>;
            </span><span>$res</span>['dest']=<span>$destination</span><span>;
        }</span><span>else</span><span>{
            </span><span>$res</span>['mes']=<span>$filename</span>."文件上傳失敗"<span>;
        }
    }</span><span>else</span><span>{
        </span><span>switch</span> (<span>$error</span><span>) {
            </span><span>case</span> '1':
            <span>$res</span>['mes']="超過了配置文件上傳文件的大小"<span>;
            </span><span>break</span><span>;
            </span><span>case</span> '2':
            <span>$res</span>['mes']="超過表單設置上傳文件文件的大小"<span>;
            </span><span>break</span><span>;
            </span><span>case</span> '3':
            <span>$res</span>['mes']="文件部分被上傳"<span>;
            </span><span>break</span><span>;
            </span><span>case</span> '4':
            <span>$res</span>['mes']="沒有文件被上傳"<span>;

            </span><span>break</span><span>;
            </span><span>case</span> '6':
            <span>$res</span>['mes']="沒有找到臨時目錄"<span>;
            </span><span>break</span><span>;
            </span><span>case</span> '7':
            <span>$res</span>['mes']="文件不可寫"<span>;

            </span><span>break</span><span>;
            </span><span>default</span>:
            <span>$res</span>['mes']="上傳文件失敗"<span>;
            </span><span>break</span><span>;
        }
    }

    </span><span>return</span> <span>$res</span><span>;

}</span>

It also involves two small functions:

<span>/*</span><span>*
 * 獲得文件擴展名
 * @param  string $filename 上傳文件名
 * @return string           返回擴展名
 </span><span>*/</span>
<span>function</span> getExt(<span>$filename</span><span>){
    </span><span>$arr</span>=<span>explode</span>('.', <span>basename</span>(<span>$filename</span><span>));

    </span><span>return</span> <span>end</span>(<span>$arr</span><span>);
}
</span><span>/*</span><span>*
 * 獲得文件唯一擴展名
 * @return string 經(jīng)過md5后生成32位唯一的上傳文件名
 </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>

Feeling:

I came into contact with php file uploading a long time ago, and it felt like a mess at the time. Now it seems that as long as you understand the information contained in $_FILES, use the knowledge you have written to deal with some tips, the system will consider it logically, and encapsulate the functions in a timely manner, then file upload can be carried out quickly. The code I show this time will definitely not meet any needs, so it can be modified appropriately to become your own code. For example, if the uploaded file is an image, it cannot be judged by the extension alone. It also needs to be verified by using the characteristics of the image.