Chat room based on PHP (1)_PHP tutorial
Once upon a time there was a fairly popular web chat room called the Star Trekker Chat Room. I'm in this chat room thanks to a friend of mine, and even though the Star Trekker chat buddies are almost certainly not from the same circle as me, I find most of them to be friendly and interesting. But when Star Trekker shut down, thanks to Perl running in the background, it ate up the server's resources, so these happy and friendly people had to leave and had nowhere to go. I was lucky enough to open my own chat room imitating Star
Trekker during that time, and began to try to connect with many of the original Trekker’s homeless chat rooms. Wary of the resource consumption problems caused by Perl, I was very happy when a friend recommended PHP to me.
This well-designed web chat room takes variables passed from a form, processes them into HTML, and writes them to a file. Put the form and message files in a frame, and you can see that it looks a lot like a chat room called BeSeen. The nice thing about it, of course, is that
our chat room is a little smarter than its BeSeen cousin.
The above is the basic form for input. You might want to make it more aesthetically pleasing, but for all intents and purposes, this is what you're dealing with. It sends two variables to chat.php3, called $name and $message.
However, before processing those variables, we need to take out the current content from the message file, otherwise we can only see one message at a time. There is almost no one way to manage the conversation. As long as I am familiar with the structure of my own message file, I know that every message ends with a carriage return character. This means that you can use the file() function to read the message file into an array.
The message file has 12 lines. In the 12 lines, line 1 contains header information, lines 2 to 11 are old messages, and line 12 contains my footer.
What I'm most interested in is getting a string that contains all those old messages.
// Read the file into an array
$message_array = file("messages.html");
// Edit the string
for ($counter = 1; $counter $old_messages .= $message_array[$counter];
}
?>
When processing strings, I will use a for loop The $counter is initialized to 1 instead of 0. This is because I know that the 0th element of the $message_array array contains my header information, and I don't need it. The end condition of the loop is $counter

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.


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