php实现常用文件上传类的示例

废话不多说，直接上代码：

<?php/** * 上传文件类 * @param _path : 服务器文件存放路径 * @param _allowType : 允许上传的文件类型和所对应的MIME * @param _file : 上传的文件信息 */class Upload{ private $_path; private $_allowType; private $_file; /**  * 构造函数  * @param string : 服务器上存放上传文件的路径  */ function __construct( $path = '' ) {  $this->_path = $path;  $this->_allowType = array(    // images    'bmp' => 'image/x-ms-bmp',    'jpg' => 'image/jpeg',    'jpeg' => 'image/jpeg',    'gif' => 'image/gif',    'png' => 'image/png',    'tif' => 'image/tiff',    'tiff' => 'image/tiff',    'tga' => 'image/x-targa',    'psd' => 'image/vnd.adobe.photoshop',    //文本    'txt' => 'text/plain',    'php' => 'text/x-php',    'html' => 'text/html',    'htm' => 'text/html',    'js' => 'text/javascript',    'css' => 'text/css',    'rtf' => 'text/rtf',    'rtfd' => 'text/rtfd',    'py' => 'text/x-python',    'java' => 'text/x-java-source',    'rb' => 'text/x-ruby',    'sh' => 'text/x-shellscript',    'pl' => 'text/x-perl',    'sql' => 'text/x-sql',    //应用    'exe' => 'application/octet-stream',    'doc' => 'application/vnd.ms-word',    'docx' => 'application/vnd.ms-word',    'xls' => 'application/vnd.ms-excel',    'ppt' => 'application/vnd.ms-powerpoint',    'pps' => 'application/vnd.ms-powerpoint',    'pdf' => 'application/pdf',    'xml' => 'application/xml',    //音频    'mp3' => 'audio/mpeg',    'mid' => 'audio/midi',    'ogg' => 'audio/ogg',    'mp4a' => 'audio/mp4',    'wav' => 'audio/wav',    'wma' => 'audio/x-ms-wma',    //视频    'avi' => 'video/x-msvideo',    'dv' => 'video/x-dv',    'mp4' => 'video/mp4',    'mpeg' => 'video/mpeg',    'mpg' => 'video/mpeg',    'mov' => 'video/quicktime',    'wm' => 'video/x-ms-wmv',    'flv' => 'video/x-flv',    'mkv' => 'video/x-matroska'   ); } /**  * 上传函数  * @param string : 表单元素的name 值  * @return [type]  */ public function upload( $txtName = '' ) {  $this->_file = $_FILES[$txtName];  if( $this->_file['error'] == 0){   $fileType = end( explode('.', $this->_file['name'] ));   $allowType = array();   foreach( $this->_allowType as $item=>$value ){    $allowType[] = $item;   }   if( !in_array($fileType, $allowType)){    die('上传的文件格式不正确！');   }else{    if(move_uploaded_file($this->file['tmp_name'], ($this->path).$this->file['name']))     {      echo "<script>alert('上传成功!')</script>";     }    else     {      echo "<script>alert('上传失败!');</script>";     }   }  }else{   //没有正确上传   switch ($this->file['error']){    case 1:     die('文件大小超过系统限制。');     break;    case 2:     die('文件大小超过预定义限制。');     break;    case 3:     die('文件为完全上传。');     break;    case 4:     die('未上传任何文件。');     break;    default:     die('上传出错');     break;   }  } } //end upload}