php文件上傳之多文件上傳，

　　　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(chǔ)上,所以這里就不贅述文件上傳服務(wù)器配置，表單設(shè)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><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>

　　兩個對比，發(fā)現(xiàn)僅僅是name的不同，第一個將name設(shè)置成數(shù)組的形式，而第二個則是我們通常設(shè)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(diǎn)點(diǎn)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：

　　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; }

通過這個函數(shù)，將$_FILES轉(zhuǎn)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(jìn)行上傳，這也是本文的重點(diǎn)。

　　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>$res</span>['mes']="超過表單設(shè)置上傳文件文件的大小"<span>;
            </span><span>break</span><span>;
            </span><span>case</span> '3':
            <span>$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(kuò)展名
 * @param  string $filename 上傳文件名
 * @return string           返回擴(kuò)展名
 </span><span>*/</span>
<span>function</span> getExt(<span>$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(kuò)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>

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感受：

　　很久前接觸過php文件上傳，當(dāng)時感覺一團(tuán)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(dāng)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(kuò)展名是絕對不能判斷的，還需要利用圖片的特性加以驗(yàn)證。

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