用php实现常用文件上传类的方法

<?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
}