PHP 文件操作2 上传下载

来源：互联网发布：恶魔之魂剧情知乎编辑：程序博客网时间：2024/05/16 05:07

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：

*************************

<html>

<head>

<title>file upload</title>

</head>

<body>

<!--upload table

</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>

*************************