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php下载的功能

时间：2021-07-01 10:21:17 帮助过：26人阅读

这篇文章介绍的内容是关于php下载的功能，有着一定的参考价值，现在分享给大家，有需要的朋友可以参考一下

upload.php开始

<?php
function upload_file($fileInfo,$uploadPath='./uploads',$imageFlag=true,$allowExt=array('jpeg','jpg','png','gif'),$maxSize=209708){
	define('UPLOAD_ERRS',[
	    'upload_max_filesize'=>'超过了PHP配置文件中upload_max_filesize选项的值',
	    'form_max_size'=>'超过了表单MAX_FILE_SIZE选项的值',
	    'upload_file_partial'=>'文件部分被上传',
	    'no_upload_file_select'=>'没有选择上传文件',
	    'upload_system_error'=>'系统错误',
	    'no_allow_ext'=>'非法文件类型',
	    'exceed_max_size'=>'超出允许上传的最大值',
	    'not_true_image'=>'文件不是真实图片',
	    'not_http_post'=>'文件不是通过HTTP POST方式上传上来的',
	    'move_error'=>'文件移动失败'
	]);
//检测是否上传是否有错误
  if($fileInfo['error']===UPLOAD_ERR_OK){
    //检测上传文件类型
    $ext=strtolower(pathinfo($fileInfo['name'],PATHINFO_EXTENSION));
    if(!in_array($ext,$allowExt)){
      echo  UPLOAD_ERRS['no_allow_ext'];
      return false;
    }
    //检测上传文件大小是否符合规范
    if($fileInfo['size']>$maxSize){
      echo UPLOAD_ERRS['exceed_max_size'];
      return false;
    }
    //检测是否是真实图片
    if($imageFlag){
      if(@!getimagesize($fileInfo['tmp_name'])){
        echo UPLOAD_ERRS['not_true_image'];
        return false;
      }
    }
    //检测文件是否通过HTTP POST方式上传上来的
    if(!is_uploaded_file($fileInfo['tmp_name'])){
      return UPLOAD_ERRS['not_http_post'];
    }
    //检测目标目录是否存在，不存在则创建
    if(!is_dir($uploadPath)){
      mkdir($uploadPath,0777,true);
    }
    //生成唯一文件名，防止重名产生覆盖
    $uniName=md5(uniqid(microtime(true),true)).'.'.$ext;
    $dest=$uploadPath.DIRECTORY_SEPARATOR.$uniName;


    //移动文件
    if(@!move_uploaded_file($fileInfo['tmp_name'],$dest)){
      echo UPLOAD_ERRS['move_error'];
      return false;
    }
    echo '文件上传成功';
    return $dest;
  }else{
    switch($fileInfo['error']){
      case 1:
      // $mes='超过了PHP配置文件中upload_max_filesize选项的值';
      $mes=UPLOAD_ERRS['upload_max_filesize'];
      break;
      case 2:
      $mes=UPLOAD_ERRS['form_max_size'];
      break;
      case 3:
      $mes=UPLAOD_ERRS['upload_file_partial'];
      break;
      case 4:
      $mes=UPLOAD_ERRS['no_upload_file_select'];
      break;
      case 6:
      case 7:
      case 8:
      $mes=UPLAOD_ERRS['upload_system_error'];
      break;
    }
    echo $mes;
    return false;
  }
}
?>

upload.php结束

html的开始
<!DOCTYPE html>
<html>
<head>
 <meta charset="UTF-8">
 <title>Document</title>
</head>
<body>
 <!-- <a href="http://localhost:8081/download.php?filename=5.html">下载5.html</a> -->
 <h1>文件上传</h1>
 <form action="http://localhost:8081/doUpload.php" method='post' enctype="multipart/form-data">
 <input type="file" name="myFile" id="">
 <input type="submit" value="立即上传">
 </form>
</body>
</html>
html的结束

doUpload.php的开始
<?php
 require_once('upload.php');
 $fileInfo=$_FILES['myFile'];
var_dump(upload_file($fileInfo));
?>

doUpload.php的结束

php下载的功能

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