PHP 文件操作2 上传下载
1 PHP中上传可以使用全局变量: $_FILES
2 将上传的文件转移到指定的文件夹中：move_uploaded_file
3 多文件上传，需要在html配置input时将名字后面加[],参考下面实例
4 过滤：大小，类型
5 下载：通过html格式的超级链接标签<a>来实现文件的下载，但这不是自动下载，而是调用浏览器的下载工具。
几个attention:
1 上传给出的文件夹必须存在，刚才做实验时，还需chmod o+w 新建的文件夹 ,否则就会failed.
2 $_FILES['upload']['name']等中间的参数名词必须写准确
自己实验所用例子：
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<html>
<head>
<title>file upload</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
</head>
<body>
<form enctype="multipart/form-data" action="upload.php" method="POST">
<!--upload table
<input name="upload[]" type="file"><br>
<input name="upload[]" type="file"><br>
<input name="upload[]" type="file"><br>
<input type="submit" value="Upload"> -->
<!-- for the filter , here shut the multi-files uploading, add single file uploading-->
<input name="upload" type="file"><Br>
<input type="submit" value="upload">
</form>
<?php
/*
$fname=$_FILES['upload']['name'];
echo "the upload filename is:".$fname."<Br>";
$ftype=$_FILES['upload']['type'];
echo "the upload filetype is".$ftype."<Br>";
$fsize=$_FILES['upload']['size'];
echo "the upload filesize is".$fsize."<br>";
$ferror=$_FILES['upload']['error'];
echo "the upload fileerror is".$ferror."<Br>";
if(move_uploaded_file($_FILES['upload']['tmp_name'],"/var/www/".$fname))
{
echo "<br>upload succes! <br>";
}
else
{
echo "<br>failed!<br>";
}
//multi-files uploading
foreach ($_FILES['upload']['name'] as $index=>$name)
{
if(move_uploaded_file($_FILES['upload']['tmp_name'][$index],"/var/www/myupload/".$name))
{
echo "file".$name."uploading success<Br>";
}
else
{
echo "file".$name."uploading failed<br>";
}
}
// filter pictures:
$uploadfile="/var/www/myupload/img/".$_FILES['upload']['name'];
$message='';
if($_FILES['upload']['type']!='image/bmp')
{
echo '<p> the uploapfile type can only be : bmp</p>';
exit;
}
if($_FILES['upload']['size']>80480)
{
echo '<p>the file size canot beyongd 80kb </p>';
exit;
}
if(move_uploaded_file($_FILES['upload']['tmp_name'],$uploadfile))
{
echo "upload success!";
exit;
}
echo "failed";
*/
//downloading:
$path="/var/www/myupload/";
if(is_dir($path))
{
$openHandle=opendir($path);
while(false !== ($file = readdir($openHandle)))
{
echo "<a href='$file'>".$file."</a>";
echo "<br>";
}
closedir($openHandle);
}
else
{
echo " the folder isnot exist!";
}
?>
</body>
</html>
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