


How to use ftp in php to implement file upload and download functions
This article mainly introduces the file upload and download function of PHP using ftp in detail. It has certain reference value. Interested friends can refer to it
ftp file upload
php comes with a function package for ftp operation. A relatively simple ftp file upload operation can be completed through the following steps:
1. Confirm the ip address and port information of the ftp server (if you are using the default port, you don’t need to care);
2. Perform the ftp_connect operation and connect to the ftp server (you need to pay attention to whether the port parameter is set);
3. Perform the ftp_login operation and use the ftp username and password to log in;
4. The distinction begins here. If you only need to upload files and there are no other requirements, then you can perform the ftp_put operation of file upload here; if If there is a need to store uploaded files according to the directory, then continue downward;
5. Use ftp_nlist to obtain the directory and file names in the given ftp directory, and check whether the required directory exists. If it does not exist, ftp_mkdir is required to create the directory;
6. Switch to ftp_chdir in the target directory;
7. Perform ftp_put operation to upload files;
8. Perform ftp_close to close the ftp connection.
In order to upload files according to the date format directory in ftp, make a simple code implementation:
<?php $host = '10.0.0.42'; $user = 'uftp'; $pwd = 'uftp'; // 进行ftp连接,根据port是否设置,传递的参数会不同 if(empty($port)){ $f_conn = ftp_connect($host); }else{ $f_conn = ftp_connect($host, $port); } if(!$f_conn){ echo "connect fail\n"; exit(1); } echo "connect success\n"; // 进行ftp登录,使用给定的ftp登录用户名和密码进行login $f_login = ftp_login($f_conn,$user,$pwd); if(!$f_login){ echo "login fail\n"; exit(1); } echo "login success\n"; // 获取当前所在的ftp目录 $in_dir = ftp_pwd($f_conn); if(!$in_dir){ echo "get dir info fail\n"; exit(1); } echo "$in_dir\n"; // 获取当前所在ftp目录下包含的目录与文件 $exist_dir = ftp_nlist($f_conn, ftp_pwd($f_conn)); print_r($exist_dir); // 要求是按照日期在ftp目录下创建文件夹作为文件上传存放目录 echo date("Ymd")."\n"; $dir_name = date("Ymd"); // 检查ftp目录下是否已存在当前日期的文件夹,如不存在则进行创建 if(!in_array("$in_dir/$dir_name", $exist_dir)){ if(!ftp_mkdir($f_conn, $dir_name)){ echo "mkdir fail\n"; exit(1); }else{ echo "mkdir $dir_name success\n"; } } // 切换目录 if(!ftp_chdir($f_conn, $dir_name)){ echo "chdir fail\n"; exit(1); }else{ echo "chdir $dir_name success\n"; } // 进行文件上传 $result = ftp_put($f_conn, 'bbb.mp3', '/root/liang/ftp/bbb.mp3', FTP_BINARY); if(!$result){ echo "upload file fail\n"; exit(1); }else{ echo "upload file success\n"; exit(0); }
Print:
root@webdevelop232:~/liang/ftp# php ftp.php connect success login success /home/uftp Array ( [0] => /home/uftp/Kalimba.mp3 [1] => /home/uftp/test.txt ) 20170721 mkdir 20170721 success chdir 20170721 success upload file success
You can see that the printing operation is successful. At this time, go to the ftp server directory and you can see the upload. file.
ftp file download
Compared to file upload, it is really rare to use php to download ftp files, but since this function is available, it means There's always a chance someone will use it, so make a simple example as well.
Use the bbb.mp3 file uploaded above as the download target, download it to the current directory, and name it 1.mp3:
<?php $host = '10.0.0.42'; $uname = 'uftp'; $upwd = 'uftp'; // 进行ftp连接 if(empty($port)){ $f_conn = ftp_connect($host); }else{ $f_conn = ftp_connect($host, $port); } if(!$f_conn){ echo "ftp connect fail\n"; exit(1); } // 进行ftp登录 if(!ftp_login($f_conn, $uname, $upwd)){ echo "ftp login fail\n"; exit(1); } // 进行ftp下载 if(!ftp_get($f_conn, './1.mp3', ftp_pwd($f_conn).'/'.date('Ymd').'/bbb.mp3', FTP_BINARY)){ echo "ftp download fail\n"; exit(1); }else{ echo "ftp download success\n"; exit(0); }
Related recommendations:
PHP operation FTP class (upload, download, move, create, etc.), phpftp_PHP tutorial
PHP operates FTP classes (upload, download, move, create, etc.), phpftp
Python is implemented based on the FTP module ftpFile upload
The above is the detailed content of How to use ftp in php to implement file upload and download functions. For more information, please follow other related articles on the PHP Chinese website!

Reasons for PHPSession failure include configuration errors, cookie issues, and session expiration. 1. Configuration error: Check and set the correct session.save_path. 2.Cookie problem: Make sure the cookie is set correctly. 3.Session expires: Adjust session.gc_maxlifetime value to extend session time.

Methods to debug session problems in PHP include: 1. Check whether the session is started correctly; 2. Verify the delivery of the session ID; 3. Check the storage and reading of session data; 4. Check the server configuration. By outputting session ID and data, viewing session file content, etc., you can effectively diagnose and solve session-related problems.

Multiple calls to session_start() will result in warning messages and possible data overwrites. 1) PHP will issue a warning, prompting that the session has been started. 2) It may cause unexpected overwriting of session data. 3) Use session_status() to check the session status to avoid repeated calls.

Configuring the session lifecycle in PHP can be achieved by setting session.gc_maxlifetime and session.cookie_lifetime. 1) session.gc_maxlifetime controls the survival time of server-side session data, 2) session.cookie_lifetime controls the life cycle of client cookies. When set to 0, the cookie expires when the browser is closed.

The main advantages of using database storage sessions include persistence, scalability, and security. 1. Persistence: Even if the server restarts, the session data can remain unchanged. 2. Scalability: Applicable to distributed systems, ensuring that session data is synchronized between multiple servers. 3. Security: The database provides encrypted storage to protect sensitive information.

Implementing custom session processing in PHP can be done by implementing the SessionHandlerInterface interface. The specific steps include: 1) Creating a class that implements SessionHandlerInterface, such as CustomSessionHandler; 2) Rewriting methods in the interface (such as open, close, read, write, destroy, gc) to define the life cycle and storage method of session data; 3) Register a custom session processor in a PHP script and start the session. This allows data to be stored in media such as MySQL and Redis to improve performance, security and scalability.

SessionID is a mechanism used in web applications to track user session status. 1. It is a randomly generated string used to maintain user's identity information during multiple interactions between the user and the server. 2. The server generates and sends it to the client through cookies or URL parameters to help identify and associate these requests in multiple requests of the user. 3. Generation usually uses random algorithms to ensure uniqueness and unpredictability. 4. In actual development, in-memory databases such as Redis can be used to store session data to improve performance and security.

Managing sessions in stateless environments such as APIs can be achieved by using JWT or cookies. 1. JWT is suitable for statelessness and scalability, but it is large in size when it comes to big data. 2.Cookies are more traditional and easy to implement, but they need to be configured with caution to ensure security.


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),

VSCode Windows 64-bit Download
A free and powerful IDE editor launched by Microsoft

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment
