File upload image in php-PHP Tutorial-php.cn

File upload image in php

迷茫

Release： 2023-03-06 22:20:01

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要实现文件上传图片我们需要写出两个php文件，第一个php文件我们需要写出一个文件上传的页面，第二个php文件我们写出实现图片上传的功能

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>

<body>

<h1>文件上传</h1>
<form action="upload.php" method="post" enctype="multipart/form-data">
   <input type="file" name="file" />
    <input type="submit" value="上传" />
</form>
</body>
</html>

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<?php
var_dump($_FILES["file"]);

// 限制文件的类型
// 限制文件的大小
// 防止文件名重复
   
//     一.防止文件名重复
//    1.修改文件名
//    流水号，时间戳+随机数+用户名

//    2.建文件夹
//    upload/20170317/lch/shangchuan/11.jpg

//    3.保存文件

if($_FILES["file"]["error"])
{
   echo $_FILES["file"]["error"];
}
else
{
   //没有出错
   
    //加限制条件
   if(($_FILES["file"]["type"]=="image/png" || $_FILES["file"]["type"]=="image/jpeg") && $_FILES["file"]["size"]<1024000)
   {
      
      //防止文件名重复
      $filename = "./img/".time().$_FILES["file"]["name"];
      
 　　　//转码
      $filename = iconv("UTF-8","gb2312",$filename);
      
      
　　　　if(file_exists($filename))
      {
         echo "该文件已存在";
      }
      else
      {
         //保存文件
         move_uploaded_file($_FILES["file"]["tmp_name"],$filename);
      }
   }
   else
   {
      echo "文件类型不对";
   }
}

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