图片上传，获取路径以及下载功能

      $src=$_FILES['n-img']['tmp_name'];
      $file=$_FILES['n-img']['name'];
      $a=explode('.',$file);
      $ext=array_pop($a);
      $rand=time().mt_rand().'.'.$ext;
      $dst="uploadimg/{$rand}";
      if($_FILES['n-img']['error']===0){
          if(move_uploaded_file($src,$dst)){
           echo "头像上传成功";
          }else{
              echo "头像未上传成功";
          }
      }

      $file=$_FILES['myfile'];
    
      if(is_uploaded_file($file['tmp_name'])){
            $rand=rand(1,1000);
            $floattime=microtime();
            $str=substr($file['name'],-4,4);
            $path='uploads/'.($rand+$floattime).$str;

            if(move_uploaded_file($file['tmp_name'],$path)){
            
            echo "上传成功";
 
            }
      }

文件的下载

<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>下载功能</title>
</head>
<body>
<a href="1.php?filename=2.jpg">下载图片</a>
</body>
</html>

<?php
     $filename=$_GET['filename'];
     header('content-disposition:attachment;filename='.basename($filename));//函数返回路径中的文件名部分
     header('content-length:'.filesize($filename));//返回指定文件的大小
     readfile($filename);