在胡说之前，首先声明，本文是建立在掌握php单文件上传的基础上,所以这里就不赘述文件上传服务器配置，表单设置该注意的地方了。
话不多少，直入主题，在请求页面方面有两种写法（只呈现表单部分，以上传三个文件为例。）
<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>
请选择我的上传文件
</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>="上传"</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>
请选择我的上传文件
</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>="上传"</span> <span>/></span>
<span></</span><span>form</span><span>></span>两个对比，发现仅仅是name的不同，第一个将name设置成数组的形式，而第二个则是我们通常设置也很容易想到的一种方法。
虽然表面上显示的仅仅有一点点不同，但真正提交到doAction.php页面的$_FILES则有很大不同。
第一种的$_FILES是一个三维数组，而第二种是二维数组，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 $files;
}
通过这个函数，将$_FILES转化为下面格式:
此刻，两种上传方式已经处在同一起跑线了，下面的工作便是编写uploadFile()函数对每个文件进行上传，这也是本文的重点。
文件上传函数：
<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>$filename</span>."文件超过规定上传大小"<span>;
}
</span><span>$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>$filename</span>.'文件名不合乎规范'<span>;
}
</span><span>if</span> (!<span>is_uploaded_file</span>(<span>$temp_name</span><span>)) {
</span><span>$res</span>['mes']=<span>$filename</span>."文件不是通过HTTP POST 方法上传上传过来的"<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>.'上传成功'<span>;
</span><span>$res</span>['dest']=<span>$destination</span><span>;
}</span><span>else</span><span>{
</span><span>$res</span>['mes']=<span>$filename</span>."文件上传失败"<span>;
}
}</span><span>else</span><span>{
</span><span>switch</span> (<span>$error</span><span>) {
</span><span>case</span> '1':
<span>$res</span>['mes']="超过了配置文件上传文件的大小"<span>;
</span><span>break</span><span>;
</span><span>case</span> '2':
<span>$res</span>['mes']="超过表单设置上传文件文件的大小"<span>;
</span><span>break</span><span>;
</span><span>case</span> '3':
<span>$res</span>['mes']="文件部分被上传"<span>;
</span><span>break</span><span>;
</span><span>case</span> '4':
<span>$res</span>['mes']="没有文件被上传"<span>;
</span><span>break</span><span>;
</span><span>case</span> '6':
<span>$res</span>['mes']="没有找到临时目录"<span>;
</span><span>break</span><span>;
</span><span>case</span> '7':
<span>$res</span>['mes']="文件不可写"<span>;
</span><span>break</span><span>;
</span><span>default</span>:
<span>$res</span>['mes']="上传文件失败"<span>;
</span><span>break</span><span>;
}
}
</span><span>return</span> <span>$res</span><span>;
}</span>其中还涉及了两个小函数：
<span>/*</span><span>*
* 获得文件扩展名
* @param string $filename 上传文件名
* @return string 返回扩展名
</span><span>*/</span>
<span>function</span> getExt(<span>$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>$arr</span><span>);
}
</span><span>/*</span><span>*
* 获得文件唯一扩展名
* @return string 经过md5后生成32位唯一的上传文件名
</span><span>*/</span>
<span>function</span><span> getUniName(){
</span><span>return</span> <span>md5</span>(<span>uniqid</span>(<span>microtime</span>(<span>true</span>),<span>true</span><span>));
}</span>
感受：
很久前接触过php文件上传，当时感觉一团乱麻。现在看来只要掌握$_FILES里面包含什么信息，利用自己写过的知识处理一些小技巧，系统有逻辑的加以考虑，适时地封装函数，以后文件上传就可以很快地展开。这次我展现的代码必然不是能满足任何需要，所以可以适当改造，成为自己的代码。比如如果要求上传文件是图片内容的话，单靠扩展名是绝对不能判断的，还需要利用图片的特性加以验证。
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