我们下面为大家具体讲解举例来说：用户可上传一种展品并可为该展品上传一张缩略图，那么缩略图文件限制类型可能为jpg,，gif，png等，而展品文件限制类型可能为mov,avi,mpeg等，而图片大小可能限制为100KB，音频视频大小可能限制为2MB。类代码如下：
<ol class="dp-xml">
<li class="alt"><span><span>class Upload </span></span></li>
<li class=""><span>{ </span></li>
<li class="alt"><span> public $InputName; // 文件上传域控件名 </span></li>
<li class=""><span> </span></li>
<li class="alt"><span> /** </span></li>
<li class=""><span> * 允许上传的文件类型 </span></li>
<li class="alt"><span> * 形式为 array('image/jpeg', 'image/png', 'image/gif') 或包含此类数组的数组（与每个上传域控件对应） </span></li>
<li class=""><span> */ </span></li>
<li class="alt"><span> public $FileType; </span></li>
<li class=""><span> </span></li>
<li class="alt"><span> /** </span></li>
<li class=""><span> * 最大上传文件大小（单位：byte） </span></li>
<li class="alt">
<span> * 形式为 array('image' =</span><span class="tag"><strong><font color="#006699">></font></strong></span><span> $size, 'audio' =</span><span class="tag"><strong><font color="#006699">></font></strong></span><span> $size)（表示每种应用文件类型所对应的上传大小） 或包含此类数组的数组（与每个上传域控件对应）或一数值（表示所有上传文件均限制在此大小之下） </span>
</li>
<li class=""><span> */ </span></li>
<li class="alt"><span> public $FileMaxSize; </span></li>
<li class=""><span> </span></li>
<li class="alt"><span> public $FileSavePath; // 文件保存路径（可为数组形式，表示不同上传域上传文件到不同的路径） </span></li>
<li class=""><span> public $FileSaveName; // 文件保存名（不包含后缀名）（可为数组形式，表示不同上传域上传文件保存的不同名称） </span></li>
<li class="alt"><span> public $NoteFileFalse; // 文件错误提示 </span></li>
<li class=""><span> public $NoteFileType; // 文件类型不符提示 </span></li>
<li class="alt"><span> public $NoteFileSize; // 文件大小超出提示 </span></li>
<li class=""><span> </span></li>
<li class="alt"><span> /* 上传文件并返回文件名信息（包含后缀名） */ </span></li>
<li class=""><span> public function UploadFile() </span></li>
<li class="alt"><span> { </span></li>
<li class="">
<span> $this-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>CheckFile(); // 检验文件 </span>
</li>
<li class="alt">
<span> $</span><span class="attribute"><font color="#ff0000">file</font></span><span> = $_FILES[$this-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>InputName]; </span>
</li>
<li class="">
<span> $</span><span class="attribute"><font color="#ff0000">file_save_full_name</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">array</font></span><span>(); // 文件保存名（包含后缀名） </span>
</li>
<li class="alt"><span> </span></li>
<li class="">
<span> foreach ($file['name'] as $</span><span class="attribute"><font color="#ff0000">key</font></span><span> =</span><span class="tag"><strong><font color="#006699">></font></strong></span><span> $name) </span>
</li>
<li class="alt"><span> { </span></li>
<li class=""><span> if (!empty($name)) // 文件不为空 </span></li>
<li class="alt"><span> { </span></li>
<li class=""><span> /* 确定文件保存路径 */ </span></li>
<li class="alt">
<span> if (is_array($this-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>FileSavePath)) </span>
</li>
<li class=""><span> { </span></li>
<li class="alt">
<span> $</span><span class="attribute"><font color="#ff0000">file_save_path</font></span><span> = $this-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>FileSavePath[$key]; </span>
</li>
<li class=""><span> } </span></li>
<li class="alt"><span> else </span></li>
<li class=""><span> { </span></li>
<li class="alt">
<span> $</span><span class="attribute"><font color="#ff0000">file_save_path</font></span><span> = $this-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>FileSavePath; </span>
</li>
<li class=""><span> } </span></li>
<li class="alt"><span> </span></li>
<li class=""><span> /* 确定文件保存名（不包含后缀名） */ </span></li>
<li class="alt">
<span> if (is_array($this-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>FileSaveName)) </span>
</li>
<li class=""><span> { </span></li>
<li class="alt">
<span> $</span><span class="attribute"><font color="#ff0000">file_save_name</font></span><span> = $this-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>FileSaveName[$key]; </span>
</li>
<li class=""><span> } </span></li>
<li class="alt"><span> else </span></li>
<li class=""><span> { </span></li>
<li class="alt">
<span> $</span><span class="attribute"><font color="#ff0000">file_save_name</font></span><span> = $this-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>FileSaveName; </span>
</li>
<li class=""><span> } </span></li>
<li class="alt"><span> </span></li>
<li class=""><span> /* 开始保存 */ </span></li>
<li class="alt">
<span> $this-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>CreatePath($file_save_path); // 如果路径不存在则创建路径 </span>
</li>
<li class="">
<span> move_uploaded_file($file["tmp_name"][$key], $file_save_path . $file_save_name . $this-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>GetSuffix($file['name'][$key])); </span>
</li>
<li class="alt">
<span> $file_save_full_name[] = $file_save_name . $this-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>GetSuffix($file['name'][$key]); </span>
</li>
<li class=""><span> } </span></li>
<li class="alt"><span> else </span></li>
<li class=""><span> { </span></li>
<li class="alt"><span> $file_save_full_name[] = null; </span></li>
<li class=""><span> } </span></li>
<li class="alt"><span> } </span></li>
<li class=""><span> </span></li>
<li class="alt"><span> unlink($file); </span></li>
<li class=""><span> </span></li>
<li class="alt"><span> /* 如果只有一个文件，则返回单个文件名 */ </span></li>
<li class=""><span> if (count($file_save_full_name) == 1) </span></li>
<li class="alt"><span> { </span></li>
<li class="">
<span> $</span><span class="attribute"><font color="#ff0000">file_save_full_name</font></span><span> = $file_save_full_name[0]; </span>
</li>
<li class="alt"><span> } </span></li>
<li class=""><span> </span></li>
<li class="alt"><span> return $file_save_full_name; </span></li>
<li class=""><span> } </span></li>
<li class="alt"><span> </span></li>
<li class=""><span> /* 检验文件 */ </span></li>
<li class="alt"><span> private function CheckFile() </span></li>
<li class=""><span> { </span></li>
<li class="alt">
<span> $</span><span class="attribute"><font color="#ff0000">file</font></span><span> = $_FILES[$this-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>InputName]; </span>
</li>
<li class=""><span> </span></li>
<li class="alt">
<span> foreach ($file['name'] as $</span><span class="attribute"><font color="#ff0000">key</font></span><span> =</span><span class="tag"><strong><font color="#006699">></font></strong></span><span> $name) </span>
</li>
<li class=""><span> { </span></li>
<li class="alt"><span> if (!empty($name)) // 文件不为空 </span></li>
<li class=""><span> { </span></li>
<li class="alt">
<span> $</span><span class="attribute"><font color="#ff0000">type</font></span><span> = $file['type'][$key]; </span>
</li>
<li class="">
<span> $</span><span class="attribute"><font color="#ff0000">size</font></span><span> = $file['size'][$key]; </span>
</li>
<li class="alt">
<span> $</span><span class="attribute"><font color="#ff0000">error</font></span><span> = $file['error'][$key]; </span>
</li>
<li class=""><span> </span></li>
<li class="alt"><span> /* 确定允许上传文件类型列表 */ </span></li>
<li class="">
<span> if (is_array($this-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>FileType[0])) </span>
</li>
<li class="alt"><span> { </span></li>
<li class="">
<span> $</span><span class="attribute"><font color="#ff0000">file_type</font></span><span> = $this-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>FileType[$key]; </span>
</li>
<li class="alt"><span> } </span></li>
<li class=""><span> else </span></li>
<li class="alt"><span> { </span></li>
<li class="">
<span> $</span><span class="attribute"><font color="#ff0000">file_type</font></span><span> = $this-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>FileType; </span>
</li>
<li class="alt"><span> } </span></li>
<li class=""><span> </span></li>
<li class="alt"><span> /* 确定最大上传文件大小 */ </span></li>
<li class="">
<span> if (is_array($this-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>FileMaxSize)) </span>
</li>
<li class="alt"><span> { </span></li>
<li class="">
<span> $</span><span class="attribute"><font color="#ff0000">file_max_size_key</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">explode</font></span><span>('/', $type); </span>
</li>
<li class="alt">
<span> $</span><span class="attribute"><font color="#ff0000">file_max_size_key</font></span><span> = $file_max_size_key[0]; </span>
</li>
<li class="">
<span> if (is_array($this-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>FileMaxSize[0])) </span>
</li>
<li class="alt"><span> { </span></li>
<li class="">
<span> $</span><span class="attribute"><font color="#ff0000">file_max_size</font></span><span> = $this-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>FileMaxSize[$key][$file_max_size_key]; </span>
</li>
<li class="alt"><span> } </span></li>
<li class=""><span> else </span></li>
<li class="alt"><span> { </span></li>
<li class="">
<span> $</span><span class="attribute"><font color="#ff0000">file_max_size</font></span><span> = $this-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>FileMaxSize[$file_max_size_key]; </span>
</li>
<li class="alt"><span> } </span></li>
<li class=""><span> } </span></li>
<li class="alt"><span> else </span></li>
<li class=""><span> { </span></li>
<li class="alt">
<span> $</span><span class="attribute"><font color="#ff0000">file_max_size</font></span><span> = $this-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>FileMaxSize; </span>
</li>
<li class=""><span> } </span></li>
<li class="alt"><span> </span></li>
<li class=""><span> /* 文件错误 */ </span></li>
<li class="alt">
<span> if ($error </span><span class="tag"><strong><font color="#006699">></font></strong></span><span> 0) </span>
</li>
<li class=""><span> { </span></li>
<li class="alt">
<span> die($name . $this-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>NoteFileFalse); </span>
</li>
<li class=""><span> } </span></li>
<li class="alt"><span> </span></li>
<li class=""><span> /* 文件大小超过最大上传文件大小 */ </span></li>
<li class="alt">
<span> if ((!is_null($file_max_size) && $size </span><span class="tag"><strong><font color="#006699">></font></strong></span><span> $file_max_size) || ($</span><span class="attribute"><font color="#ff0000">size</font></span><span> == 0)) </span>
</li>
<li class=""><span> { </span></li>
<li class="alt">
<span> die($name . $this-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>NoteFileSize); </span>
</li>
<li class=""><span> } </span></li>
<li class="alt"><span> </span></li>
<li class=""><span> /* 文件类型不符 */ </span></li>
<li class="alt"><span> if (!in_array($type, $file_type)) </span></li>
<li class=""><span> { </span></li>
<li class="alt">
<span> die($name . $this-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>NoteFileType); </span>
</li>
<li class=""><span> } </span></li>
<li class="alt"><span> } </span></li>
<li class=""><span> } </span></li>
<li class="alt"><span> } </span></li>
<li class=""><span> </span></li>
<li class="alt"><span> /* 获取文件后缀名 */ </span></li>
<li class=""><span> private function GetSuffix($fileName) </span></li>
<li class="alt"><span> { </span></li>
<li class=""><span> return substr($fileName, strrpos($fileName, ".")); </span></li>
<li class="alt"><span> } </span></li>
<li class=""><span> </span></li>
<li class="alt"><span> /* 如果路径不存在则创建路径 */ </span></li>
<li class=""><span> private function CreatePath($filePath) </span></li>
<li class="alt"><span> { </span></li>
<li class=""><span> if (!file_exists($filePath)) </span></li>
<li class="alt"><span> { </span></li>
<li class=""><span> mkdir($filePath); </span></li>
<li class="alt"><span> } </span></li>
<li class=""><span> } </span></li>
<li class="alt"><span>} </span></li>
</ol>
PHP通用文件上传类的使用方法：接着以本文开头所举例子来说明该类的调用方法（呵呵，调用是很方便的）：
$upload_obj = new Upload(); // 文件上传对象
$upload_obj->InputName = 'upload_test'; // 文件上传域控件名
$upload_obj->FileType = array(array('image/jpeg', 'image/png'), array('audio/mpeg', 'video/x-msvideo')); // 允许上传的文件类型
$upload_obj->FileMaxSize = array('image' => 100 * 1024, 'audio' => 2 * 1024 * 1024, 'video' => 2 * 1024 * 1024);
$upload_obj->FileSavePath = array('upload/files/s/', 'upload/files/z/');
$upload_obj->FileSaveName = time();
$upload_obj->NoteFileFalse = '文件错误';
$upload_obj->NoteFileType = '文件类型不符';
$upload_obj->NoteFileSize = '文件大小超出';
$file_save_full_name = $upload_obj->UploadFile(); // 上传并获取文件全名（基本名加扩展名）（如果是多个文件则为数组形式）（全名用于在数据库中存储信息）
总结：就此可轻松实现若干文件上传，其实PHP通用文件上传类归根结底用到了PHP组文件上传，要注意的就是控件名的name后别忘了加上[]，这样的好处就是遇到多个文件上传时就不用在调用层进行循环或一个一个处理上传了，我们的应用也因此而轻松。
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