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In-depth analysis of php upload files

Mar 15, 2018 am 09:55 AM
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This article mainly shares with you the in-depth analysis of PHP upload files. We have also shared many articles about PHP upload files with you before. I hope this article can help everyone.

1.phpUpload file configurationphp.iniConfiguration:

(1)file_uploads=on|off Determine PHP on the server Whether the script can accept file uploads.

2max_execution_time=integer PHP The maximum amount of time, in seconds, that a script can execute before registering a fatal error

.

3memory_limit=integer Settings The maximum memory that a script can allocate, in MB. This prevents runaway scripts from monopolizing server memory.

4

upload_max_filesize=integer : Set the maximum size of the uploaded file to MB is the unit. This directive must be smaller than

post_max_size

.

5

upload_tmp_dir=string Settings Uploaded files must be stored in a temporary location on the server before being processed, until the file is moved to its final destination.

6

post_max_size=integer : OK to pass POSTThe maximum size of the message that the method can accept, in MB as the unit

2.php

Upload related methods

1bool is_uploaded_file(string $filename)

Definition: is_uploaded_file() The function determines whether the specified file is uploaded through HTTP POST

Parameters $filename : $_FILES['file_img']['tmp_name'](Example)

Specifies the file to be checked: C:\Windows\Temp\php9632.tmp

(2)bool move_uploaded_file ( string $filename , string $destination )

Definition: move_uploaded_file () Function moves the uploaded file to a new location General and is_uploaded+_file()Method used together

Parameters $filename: $_FILES['file_img']['tmp_name'](example)

Specify the files to be moved : C:\Windows\Temp\php9632.tmp                                                                             ## $ DESTION

##:

DIRNAME (__file __). Ds.'uploads'.ds. $ _ Files ['file_img'] ['name'] (Example) Specify the location of the file to be moved:

D:\myWAP\myWeb \learn\php_upload\uploads\hm_g_img.jpg##3.phpUpload case: It is stipulated that only image files can be uploaded

##(

1

Necessary folder and file

2file_unload_select.php file is used for the HTMLBrowse selection, upload click:


##enctype = "multipart/form-data" Fixed Writing method, otherwise the file upload will fail

action = "url"

## method="post"

Generally upload is post


##(

3upload.php File is used to process uploaded files Determine the type of uploaded file and Move the file to the specified directory on the server:

//接收上传文件
print_r($_FILES);
define('DS',DIRECTORY_SEPARATOR);


//判断当前上传的文件是否为图片
$img_type_arr = array('image/png','image/jpeg','image/jpeg');

//for循环遍历数组 -- 第一方法判断是否为数组中的子项
for($i=0;$i<count($img_type_arr);$i++)
{
       if($img_type_arr[$i] != $_FILES[&#39;file_img&#39;][&#39;type&#39;] && ($i == count($img_type_arr)-1) )
       {
                echo ""
                exit;
       }
}



//数组方法array_in() -- 第二方法判断是否为数组中的子项
if(!is_uploaded_file($_FILES[&#39;file_img&#39;][&#39;tmp_name&#39;]))
{
      //如果临时文件不存在,则说明没有上传到临时文件夹
      echo  &#39;上传到临时文件夹失败&#39;;
}
else
{

   //echo &#39;上传到临时文件夹成功&#39;;
   $img_path = dirname(__FILE__).DS.&#39;uploads&#39;.DS.$_FILES[&#39;file_img&#39;][&#39;name&#39;];

   //echo $img_path;

   //进行移动文件到服务器地址
   if(@move_uploaded_file($_FILES[&#39;file_img&#39;][&#39;tmp_name&#39;],$img_path))
   {
        //显示图片
        echo "<img src=".$img_path." />"
   }
   else
   {
        cho &#39;移动文件失败&#39;;

   }
}
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4show_image.php Used to receive the image file path and display the successfully uploaded image:

$img_path = $_GET[&#39;url&#39;];

echo "";
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(

5) The core of uploading is to use $_FILES sub-parameters, complete uploading and judgment :

Array ( [file_img] => Array ( [name] => news_001_01.jpg [type] => image/jpeg 
[tmp_name] => C:\Windows\Temp\php504D.tmp [error] => 0 [size] => 158360 ) )
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Analysis:

$_FILES['file_img']['name'] : news_001_01.jpg

Upload file name$_FILES['file_img'][ 'type'] : image/jpeg

Type of uploaded file$_FILES['file_img'][' tmp_name '] : C:\Windows\Temp\ php504D.tmp

The storage path of the temporary file of the uploaded file$_FILES['file_img']['error '] : 0 , 1, 2, 3, 4

0 -& GT; ## Represents the file upload successfully

1 -& GT; The size of the file exceeds the agreed value (specified by PHP.ini) 2 ->

Indicates uploading the file The size exceeds the agreed value (HTMLspecified in the form) 3 ->

Indicates that the file is only partially Upload## 4 ->

means no files were uploaded

Related recommendations:

Native JS upload large file display progress bar php upload file code

php upload file code implement native JS upload large file display progress bar example

Simple code for php upload files

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