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PHP easily implements file upload function, _PHP tutorial

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2016-07-12 08:57:50887browse

PHP can easily implement the file upload function.

This article is divided into five parts to analyze and explain the uploading of files in PHP. The specific content is as follows

  • File upload variables
  • Move the temporary files on the server to the specified directory
  • php.ini upload related configurations
  • error error number
  • Single file upload example

1. File upload variables

//$_FILES:文件上传变量
 #name 文件的名称
 #type 文件的类型
 #tmp_name 临时文件名
 #size 文件的大小
 #error 错误信息

$filename = $_FILES["myFile"]["name"];
$type = $_FILES["myFile"]["type"];
$tmp_name = $_FILES["myFile"]["tmp_name"];
$size = $_FILES["myFile"]["size"];
$error = $_FILES["myFile"]["error"];

2. Move the temporary files on the server to the specified directory 

//1.move_uploaded_file($tmp_name,$destination):将服务器上的临时文件移动到指定目录下
 #上传后文件名字，移动成功返回true，否则返回false
move_uploaded_file($tmp_name,"D:/".$filename);

//2.copy($tmp_name,$destination)
copy($tmp_name,"D:/".$filename);

3.php.ini upload related configurations

# file_uploads=On 支持HTTP上传
 # upload_tmp_dir="" 临时文件保存的目录
 # upload_max_filesize=2M 允许上传文件的最大值
 # max_file_uploads=20 允许一次上传的最大文件数
 # post_max_size=8M post方式发送数据的最大值

 # max_execution_time = 1 设置了脚本被解析器终止之前允许的最大执行时间，单位为秒，防止程序写的不好而占尽服务器资源
 # max_input_time = 60 脚本解析输入数据允许的最大时间，单位为秒
 # max_input_nesting_level = 64 设置输入变量的嵌套深度
 # max_input_vars = 1000 接受多少输入的变量
 # memory_limit = 128M 最大单线程的独立内存使用量

4.error error number

 # 0，没有错误发生，文件上传成功。
 # 1，上传的文件超过了 php.ini 中 upload_max_filesize 选项限制的值。
 # 2，上传文件的大小超过了 HTML 表单中 MAX_FILE_SIZE 选项指定的值。
 # 3，文件只有部分被上传。
 # 4，没有文件被上传。
 # 6，找不到临时文件夹。
 # 7，文件写入失败。
 # 8，上传的文件被PHP扩展程序中断

5. Single file upload example
form.html

<!doctype html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>Document</title>
</head>
<body>
<form action="fileUpload.php" method="post" enctype="multipart/form-data">
 请选择你要上传的文件:
 <input type="file" name="myFile"><br>
 <input type="submit" value="上传文件">

 <!--限制客户端上传文件的最大值 隐藏域另起一行-->
 <!--<input type="hidden" name="MAX_FILE_SIZE" value="字节数">-->

 <!--accept设置上传文件的类型-->
 <!--<input type="file" name="myfile" accept="image/jpg,image/png,image/gif">-->
</form>
</body>
</html>

fileUpload.php

header("content-type:text/html;charset:utf-8");
$fileInfo = $_FILES["myFile"];

$filename = $fileInfo["name"];
$type = $fileInfo["type"];
$error = $fileInfo["error"];
$size = $fileInfo["size"];
$tmp_name = $fileInfo["tmp_name"];
$maxSize=2*1024*1024;//允许的最大值
$allowExt=array("jpeg","jpg","gif");
$flag = true;//检测是否为真实的图片类型

//判断错误号
if($error == 0){
 //判断上传文件的大小
 if($size>$maxSize){
 exit("上传文件过大");
 }
 
 //检测文件类型
 //取出文件扩展名
 $ext = pathinfo($filename,PATHINFO_EXTENSION);
 if(!in_array($ext,$allowExt)){
 exit("非法文件类型");
 }

 //检测是否为真实的图片类型
 if($flag){
 if(@!getimagesize($tmp_name)){
  exit("不是正的图片类型");
 }
 }

 //创建目录
 $path = "D:/test/";
 if(!file_exists($path)){
 mkdir($path,0777,true);
 chmod($path,0777);
 }

 //确保文件名唯一,防止重名覆盖
 $uniName = md5(uniqid(microtime(true),true)).".".$ext;
 $destination = $path.$uniName;
 if(@move_uploaded_file($tmp_name,$destination)){
 echo "上传成功";
 }else{
 echo "上传失败";
 }
}else{
 switch($error){
 case 1:
 case 2:
 case 3:
 case 4:
 case 6:
 case 7:
 case 8:
  echo "上传错误";
  break;
 }
}

I hope this article will help you learn PHP programming.

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