在胡說之前，首先聲明，本文是建立在掌握php單文件上傳的基礎上,所以這里就不贅述文件上傳服務器配置，表單設置該注意的地方了。

　　　話不多少，直入主題，在請求頁面方面有兩種寫法（只呈現(xiàn)表單部分，以上傳三個文件為例。）

<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>input </span><span>type</span><span>="file"</span><span> name</span><span>="myfile[]"</span><span>/></span><span><span>input </span><span>type</span><span>="file"</span><span> name</span><span>="myfile[]"</span><span>/></span><span><span>input </span><span>type</span><span>="file"</span><span> name</span><span>="myfile[]"</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></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>input </span><span>type</span><span>="file"</span><span> name</span><span>="myfil1"</span><span>/></span><span><span>input </span><span>type</span><span>="file"</span><span> name</span><span>="myfil2"</span><span>/></span><span><span>input </span><span>type</span><span>="file"</span><span> name</span><span>="myfil3"</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></span></span>

　　兩個對比，發(fā)現(xiàn)僅僅是name的不同，第一個將name設置成數(shù)組的形式，而第二個則是我們通常設置也很容易想到的一種方法。

　　雖然表面上顯示的僅僅有一點點不同，但真正提交到doAction.php頁面的$_FILES則有很大不同。

　　第一種的$_FILES是一個三維數(shù)組，而第二種是二維數(shù)組，如下：

顯然我們處理第二種格式的$_FILES更加方便。當然我們也可以想辦法將第一種格式的$_FILES轉化為第二種形式，如下：\

<span>function</span><span> getFiles(){


    </span><span>foreach</span>(<span>$_FILES</span><span>as</span><span>$file</span><span>){
        </span><span>$fileNum</span>=<span>count</span>(<span>$file</span>['name'<span>]);
        </span><span>if</span> (<span>$fileNum</span>==1<span>) {

            </span><span>$files</span>=<span>$file</span><span>;
        }</span><span>else</span><span>{
            
            </span><span>for</span> (<span>$i</span>=0; <span>$i</span> $fileNum; <span>$i</span>++<span>) { 
                </span><span>$files</span>[<span>$i</span>]['name']=<span>$file</span>['name'][<span>$i</span><span>];
                </span><span>$files</span>[<span>$i</span>]['type']=<span>$file</span>['type'][<span>$i</span><span>];
                </span><span>$files</span>[<span>$i</span>]['tmp_name']=<span>$file</span>['tmp_name'][<span>$i</span><span>];
                </span><span>$files</span>[<span>$i</span>]['error']=<span>$file</span>['error'][<span>$i</span><span>];
                </span><span>$files</span>[<span>$i</span>]['size']=<span>$file</span>['size'][<span>$i</span><span>];
            }
        }

        
    }
    </span><span>return</span><span>$files</span><span>;
}</span>

? ? ? 通過這個函數(shù)，將$_FILES轉化為下面格式:

　　此刻，兩種上傳方式已經(jīng)處在同一起跑線了，下面的工作便是編寫uploadFile()函數(shù)對每個文件進行上傳，這也是本文的重點。

　　文件上傳函數(shù)：

<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>

其中還涉及了兩個小函數(shù)：

<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>

感受：

　　很久前接觸過php文件上傳，當時感覺一團亂麻?，F(xiàn)在看來只要掌握$_FILES里面包含什么信息，利用自己寫過的知識處理一些小技巧，系統(tǒng)有邏輯的加以考慮，適時地封裝函數(shù)，以后文件上傳就可以很快地展開。這次我展現(xiàn)的代碼必然不是能滿足任何需要，所以可以適當改造，成為自己的代碼。比如如果要求上傳文件是圖片內(nèi)容的話，單靠擴展名是絕對不能判斷的，還需要利用圖片的特性加以驗證。

以上就介紹了php文件上傳之多文件上傳，包括了方面的內(nèi)容，希望對PHP教程有興趣的朋友有所幫助。