Sending email using Socket 1_PHP tutorial
Among the several PHP homepage spaces that the author has applied for, there are not many that can provide mail functions. There is always nothing to do after calling the mail() function. But email plays a growing role in online life. Think about it, can an internet bug be called a real internet bug if he surfs the Internet without receiving emails? I don’t want to talk about the role of email anymore, but what should I do if the homepage space does not support mail() sending? I have also thought about sending emails through sockets, but unfortunately I am not familiar with socket programming using PHP. In addition, sending emails requires the SMTP protocol and requires reading a lot of English, so I have never studied it. Finally one day I found an article about using socket programming to send emails. I copied it as if I had found a treasure, and transformed it into a class available in PHP for everyone to use. The original article was just a simple example, and there were some errors. After many experiments and transformations, I finally changed it into a class that directly uses sockets to send emails to specified mailboxes. If you follow the previous instructions about sending By combining MIME articles, you can send emails on websites that do not support the mail() function. Because the process of sending emails takes time, it may not be exactly the same as the processing mechanism of mail(), so the speed is slower, but it can solve the urgent need to send emails. At the same time, you can also learn to use PHP for socket programming. Next, I will introduce the implementation principle of this class to you, and at the same time explain some basic knowledge about SMTP to you.
Introduction to Socket Programming
I would like to state to everyone that I am not a TCP/IP programming expert, so I am just sharing my understanding and experience here.
Use the fsockopen function to open an Internet connection. The function syntax format is:
int fsockopen(string hostname, int port, int [errno], string [errstr], int [timeout]);
The meaning of the parameters is: Needless to say, since the SMTP protocol is used here, the port number is 25. After the connection is successfully opened, a socket handle will be returned, which can be used like a file handle. Available operations include fputs(), fgets(), feof(), fclose(), etc.
That’s it for a very simple introduction.

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


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

SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.

WebStorm Mac version
Useful JavaScript development tools

Atom editor mac version download
The most popular open source editor

EditPlus Chinese cracked version
Small size, syntax highlighting, does not support code prompt function

DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software