php 实现文本文件下载

header("Content-Type: $mime");
header("Content-Disposition: attachment; filename="$file"");
header("Content-Length: ".filesize($filename));
if(strstr($mime, "text")){
    $file_handle = @fopen("$filename","r");
}else{
    $file_handle = @fopen("$filename","rb");
}

php 实现文本文件下载

<?php
$conn = mysql_connect("localhost","root","root")  or die("数据库连接失入");
  mysql_select_db("new",$conn);
?>
分类:<select name="fid">
<?php
function mainfl()
{
    global $conn;
  $result=mysql_query("select id,fid,name from a where fid=0 order by id ",$conn);//这里默认的fid=0，表示这是第一级。通过这个可以查出所有fid=0的项，即所有的第一级主类
  if ($myrow=mysql_fetch_array($result))
  {
   do {
?>
    <option value=<?php echo $myrow["id"];?>><?php echo $myrow["name"];?></option>//$myrow["id"]输出主类的ID为查询子类做准备,$myrwo["name"]主类名字
<?php echo subfl($myrow["id"],"--");?>//调用子类函数subfl,使用--<?php
   }
   while ($myrow=mysql_fetch_array($result));
  }
}
//定义子级分类
function subfl($fid,$tag)//$fid那是主类ID,$tag为连接符
{
 global $conn;
 $result1=mysql_query("select id,fid,name from a where fid=$fid  order by id",$conn);//查询出fid=$fid的所有面，这里的$fid值为$myrow["id"]
 if ($myrow1=mysql_fetch_array($result1))
 {
  do {
?>
  <option value=<?php echo $myrow1["id"];?>><?php echo $tag.$myrow1["name"];?></option>//输出子类
<?php
    subfl($myrow1["id"],"-".$tag);
   }
  while ($myrow1=mysql_fetch_array($result1));
 }
}
echo mainfl();
?>
</select>

php 数据查询与连接类

<?php
/**
 * Class program for yinghua05-2
 * designer :songsong
 */

class MySQL {
 var $link;
 var $result;
 var $querys;
 
 function MySQL($host = '', $user = '', $pw = '', $db = '', $encode = 'UTF8') {
  $this->querys = 0;
  if($host != '' && $user != '' && $db != '') {
   $this->connect($host,$user,$pw,$db,$encode);
  }
 }
 
 /**
  * connect to database
  *
  * @param unknown_type $host
  * @param unknown_type $user
  * @param unknown_type $pw
  * @param unknown_type $db
  * @return boolean
  */
 function connect($host,$user,$pw,$db,$encode = 'UTF8') {
  $resource = mysql_connect($host,$user,$pw);
  if(is_resource($resource)) {
   $this->link = $resource;
   if(mysql_select_db($db,$this->link)) {
    unset($resource);
    if (floatval(mysql_get_server_info($this->link)) > 4.1 && isset($encode)) {
     mysql_query('SET NAMES "'.$encode.'"');
    }
    return true;
   } else {
    unset($resource);
    return false;
   }
  } else {
   unset($resource);
   return false;
  }
 }
 
 /**
  * query sql
  *
  * @param unknown_type $query
  * @return unknown
  */
 function query($query) {
  $result = mysql_query($query,$this->link);
  $this->querys ++;
  if($result) {
   $this->result = $result;
   return true;
  } else {
   return false;
  }
 }
 
 /**
  * fetch a row
  *
  * @return mixed
  */
 function fetch() {
  if(is_resource($this->result)) {
   return mysql_fetch_array($this->result);
  } else {
   return false;
  }
 }
 
 /**
  * fetch all result
  *
  * @return mixed
  */
 function fetchAll() {
  if(is_resource($this->result)) {
   $temp = array();
   while ($row = mysql_fetch_array($this->result)) {
    $temp[] = $row;
   }
   return $temp;
  } else {
   return false;
  }
 }
 
 /**
  * return the querys
  *
  * @return integer
  */
 function getQuerys() {
  return $this->querys;
 }
 
 /**
  * get the numbers of the result
  *
  * @return int
  */
 function getNumberRow() {
  if (is_resource($this->result)) {
   return mysql_num_rows($this->result);
  } else {
   return 0;
  }
 }
 
 /**
  * free result
  *
  * @return boolean
  */
 function free() {
  if(is_resource($this->result)) {
   mysql_free_result($this->result);
   return true;
  } else {
   return false;
  }
 }
 
 /**
  * close mysql connect
  *
  * @return boolean
  */
 function close() {
  if(is_resource($this->link)) {
   mysql_close($this->link);
   return true;
  } else {
   return false;
  }
 }
}

?>

php类的使用实例教程

<?php
/**
 * Class program for yinghua05-2
 * designer :songsong
 */

class Template {
 var $tpl_vars;
 var $tpl_path;
 var $_debug;
 
 /**
  * Construct for Template
  * PHP5 or upper version
  */
 function __construct() {
  $this->Template();
 }
 
 /**
  * Construct for Template
  *
  * @return Template
  */
 function Template() {
  $this->tpl_vars = array();
  $this->tpl_path = '';
  $this->_debug = false;
 }
 
 /**
  * Set template path
  *
  * @param string $path
  * @return boolean
  */
 function setPath($path) {
  if(is_dir($path)) {
   $path = rtrim($path,'/').'/';
   $this->tpl_path = $path;
   return true;
  } else {
   if($this->_debug) {
    $this->_debug('template path is not exists.');
   }
   return false;
  }
 }
 
 /**
  * Enter description here...
  *
  * @param mixed $var
  * @param mixed $val
  */
 function assign($var,$val) {
  if(isset($var) && is_array($var)) {
   $this->tpl_vars = $var;
  } else if(isset($var) && $var != '') {
   $this->tpl_vars[$var] = $val;
  } else {
   if($this->_debug == true) {
    $this->_debug('set variable error.');
   }
   return false;
  }
 }
 
 /**
  * Display template file
  *
  * @param String $file_name
  */
 function display($file_name) {
  ob_start();
  extract($this->tpl_vars);
  $include_flie = $this->tpl_path . $file_name;
  if(!file_exists($include_flie)) {
   if($this->_debug)
    $this->_debug('Template file "'.$include_flie.'" is not exists.');
   else
    exit('Template error, please check it.');
  }
  include($include_flie);
  $content = ob_get_contents();
  ob_end_clean();
  
  echo $content;
 }
 
 /**
  * Debuging
  *
  */
 function _debug($msg = '') {
  die('Error :'.$msg);
 }
}

?>

php常用文件上传类

<?php
/**
 * flie class
 * (jpg,gif,png)
 */
class Upload {
 var $_file;
 var $_fileType;
 var $target = 'upload/';
 
 /**
  * construct for this class
  *
  * @param string $name
  * @return Upload
  */
 function Upload($name) {
  if(isset($_FILES[$name])) {
   $this->_file = &$_FILES[$name];
   $this->_parseUploadFile();
  } else {
   die('No file upload.');
  }
 }
 
 /**
  * set upload target path
  *
  * @param string $path
  * @return boolean
  */
 function setTarget($path = 'upload/') {
  if(is_dir($path)) {
   $this->target = rtrim($path,'/').'/';
   return true;
  } else {
   return false;
  }
 }
 
 /**
  * get the type of the file
  *
  */
 function _parseUploadFile() {
  $type = $this->_file['type'];
  if(isset($type) && $type != '') {
   switch ($type) {
    case 'image/gif':
     $this->_fileType = 'gif';
     break;
    case 'image/png':
     $this->_fileType = 'png';
     break;
    case 'image/jpeg':
     $this->_fileType = 'jpg';
     break;
    case 'image/pjpeg':
     $this->_fileType = 'jpg';
     break;
    default:
     $this->_fileType = 'unknow';
     break;
   }
  } else {
   $filename = $this->_file['name'];
   $filename = explode('.',$filename);
   $filename = strtoupper($filename[sizeof($filename) - 1]);
   switch ($filename) {
    case 'PNG':
     $this->_fileType = 'png';
     break;
    case 'JPEG':
     $this->_fileType = 'jpg';
     break;
    case 'JPG':
     $this->_fileType = 'jpg';
     break;
    case 'GIF':
     $this->_fileType = 'gif';
     break;
    default:
     $this->_fileType = 'unknow';
     break; 
   }
   unset($filename);
  }
  unset($type);
 }
 
 /**
  * upload file
  *
  * @return array
  */
 function load() {
  if($this->_fileType == 'unknow') {
   die('Can not upload this file,because the type is not allow.');
  }
  if(file_exists($this->_file['tmp_name']) && is_uploaded_file($this->_file['tmp_name'])) {
   $new_file_name = $this->target.time().'.'.$this->_fileType;
   move_uploaded_file($this->_file['tmp_name'],$new_file_name);
   
   return array('name'=>$new_file_name,'size'=>$this->_file['size'],'type'=>$this->_fileType);
  } else {
   return false;
  }
 }
}
?>