php上传文件功能函数_php资料_编程技术-你的首页-uuhomepage.com/*****************************************
Title :文件上传详解
Author:leehui1983(辉老大)
Finish Date :2006-12-28
*****************************************/
$uploaddir = "./files/";//设置文件保存目录 注意包含/
$type=array("jpg","gif","bmp","jpeg","png");//设置允许上传文件的类型
$patch="http://127.0.0.1/cr_downloadphp/upload/files/";//程序所在路径
//获取文件后缀名函数
function fileext($filename)
{
return substr(strrchr($filename, '.'), 1);
}
//生成随机文件名函数
function random($length)
{
$hash = 'CR-';
$chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz';
$max = strlen($chars) - 1;
mt_srand((double)microtime() * 1000000);
for($i = 0; $i < $length; $i++)
{
$hash .= $chars[mt_rand(0, $max)];
}
return $hash;
}
$a=strtolower(fileext($_FILES['file']['name']));
//判断文件类型
if(!in_array(strtolower(fileext($_FILES['file']['name'])),$type))
{
$text=implode(",",$type);
echo "您只能上传以下类型文件: ",$text,"";
}
//生成目标文件的文件名
else{
$filename=explode(".",$_FILES['file']['name']);
do
{
$filename[0]=random(10); //设置随机数长度
$name=implode(".",$filename);
//$name1=$name.".Mcncc";
$uploadfile=$uploaddir.$name;
}
while(file_exists($uploadfile));
if (move_uploaded_file($_FILES['file']['tmp_name'],$uploadfile)){
if(is_uploaded_file($_FILES['file']['tmp_name'])){
//输出图片预览
echo "您的文件已经上传完毕 上传图片预览: ";
echo"继续上传";
}
else{
echo "上传失败！";
}
}
}
?>