PHP上传文件实现

来源：互联网发布：樱桃3000和3494 mac 编辑：程序博客网时间：2024/05/16 08:08

实现代码见下。

upload.html

<html><head>  <title>上载文件表单</title>  <meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body>  <form method="post" action="upload.php" enctype="multipart/form-data">     <table border=0 cellspacing=0 cellpadding=0 align=center width="100%">     <tr>     <td width=55 height=20 align="center"><input type="hidden" name="MAX_FILE_SIZE" value="200000000">文件： </TD>     <td height="16">      <input name="file" type="file" value="浏览"/>      <input type="submit" value="上传" name="B1"/>     </td>     </tr>     </table>   </form></body></html>

upload.php

<html>  <head>    <title>上传结果</title>    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">  </head><body><?php $uploaddir = "./files/";//设置文件保存目录 注意包含/ $type=array("jpg","gif","bmp","jpeg","png");//设置允许上传文件的类型 //获取文件后缀名函数 function fileext($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,"<br>"; } //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))  {//输出图片预览 echo "<center>您的文件已经上传完毕 上传图片预览: </center>";echo "<br><center><a href='javascript:history.go(-1)'>继续上传</a></center>";echo "<br><center><img src='$uploadfile'></center>";  }   else  {echo "upload error:".$_FILES['file']['error'];  }} ?></body></html>