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Easily implement file upload function in php_php tips

WBOY
WBOYOriginal
2016-05-16 19:57:48983browse

This article is divided into five parts to analyze and explain PHP upload files. 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 be helpful to everyone learning PHP programming.

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