PHP is a tool for creating dynamic web pages. A web page with embedded PHP code is just like an ordinary HTML file, and you can edit it using any editor you like. This tutorial is for PHP 3.0.
What do I need? In this tutorial, we assume that your server already supports PHP and that all files have a .php3 extension. On most servers, this is the default extension for PHP files, you can check with your administrator. If your server supports PHP, this is enough. It's simple, create your PHP file and put it on your server, and the server will handle it smartly. This requires no compilation or installation of any additional tools. You can think of it this way: PHP files are regular HTML files with a new set of clever tags added.
Your first PHP code The colors in the above code are just to give you a visual aid, making it easier for you to understand the different parts of PHP tags and expressions. Please note that unlike CGI programs, executable permissions are not required. You can think of a PHP file as an HTML file containing a set of special tags that can do any number of things you're interested in.
This program is very simple, you don’t need to create a WEB page specifically for this. All it does is display: Hello World.
If you try this code and it outputs nothing, the problem may be that your server does not support PHP. Please ask your administrator to confirm.
The focus of the previous example is to introduce you to PHP tags. Use the "" tag. As shown in the example, you can freely enter and exit PHP mode in HTML files.
Some useful stuff Let’s do something more meaningful. If we want to check what the user's browser is, we can check the user agent (User Agent) string sent by the browser to the WEB server. This information is stored in a variable named $HTTP_USER_AGNET. The value of this variable can be easily displayed by using the following statement:
If the user is using Internet Explorer, then The displayed results may be: Mozilla/4.0 (compatible; MSIE 4.0; Windows 98) In fact, the user's browser also delivers a lot of other content. You can get a complete list of these variables with the following code:
Save this code into a file, say info.php3, and upload it to your server , open it with a browser, and you will see a lot of things that will surprise you. You can place multiple PHP statements within a set of PHP tags, or use a single block of code to do more. For example: If we want to check whether the browser is MSIE, we can use the following code:
{
echo "You are using Internet Explorer.< ;br>";
}
?> Here we will introduce some new things. First is the "if" statement. If you are familiar with the basic syntax of C language, then you will easily understand this code. If you are not familiar with it, it is recommended to find some related books for reference. PHP retains the simple syntax of C and avoids the difficult-to-control string and memory processing in C language.
Second, we called a function: strstr(). strstr() is a built-in function in PHP, used to find another string in a string. In the example, we search for "MSIE" in the variable $HTTP_USER_AGENT. If the font string is found, then the function returns a true value, that is, TRUE , otherwise vice versa.
Let’s take a look at how to enter and exit PHP mode, even in the middle of a PHP code block:
if (strstr($HTTP_USER_AGENT,"MSIE")){
?>
}else{
?>
}?>
Use the method of jumping out of PHP mode and outputting HTML code directly instead of using the echo statement to output the results. It is very important to not destroy the logical integrity of the PHP code. The result displayed by running this code may be:
You are using Internet Explorer
Processing forms Another powerful place of PHP is processing forms in html files. You need to understand the basic concept that all HTML file form elements will automatically be sent to the target page with the same name. This seems a bit difficult to understand, let's illustrate this through the following example:
This form only contains the necessary HTML tags and is not complete.When the user fills out this form and presses the "Submit" button, the file action.php3 is called. Suppose this file contains the following code:
Hi . You are years old.
The effect of its execution is obvious, because the variable $ name and $age are automatically set by PHP.
More? This tutorial may be expanded, but that’s it for now.
For other tutorials, please refer to:
WebMonkey
DevShed
phpTidbits
PHPBuider.com
The above has introduced the introductory tutorial of Never had a dream come true from PHPNET, including the content of Never had a dream come true. I hope it will be helpful to friends who are interested in PHP tutorials.

PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.

PHP makes it easy to create interactive web content. 1) Dynamically generate content by embedding HTML and display it in real time based on user input or database data. 2) Process form submission and generate dynamic output to ensure that htmlspecialchars is used to prevent XSS. 3) Use MySQL to create a user registration system, and use password_hash and preprocessing statements to enhance security. Mastering these techniques will improve the efficiency of web development.

PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.

PHP is still dynamic and still occupies an important position in the field of modern programming. 1) PHP's simplicity and powerful community support make it widely used in web development; 2) Its flexibility and stability make it outstanding in handling web forms, database operations and file processing; 3) PHP is constantly evolving and optimizing, suitable for beginners and experienced developers.

PHP remains important in modern web development, especially in content management and e-commerce platforms. 1) PHP has a rich ecosystem and strong framework support, such as Laravel and Symfony. 2) Performance optimization can be achieved through OPcache and Nginx. 3) PHP8.0 introduces JIT compiler to improve performance. 4) Cloud-native applications are deployed through Docker and Kubernetes to improve flexibility and scalability.

PHP is suitable for web development, especially in rapid development and processing dynamic content, but is not good at data science and enterprise-level applications. Compared with Python, PHP has more advantages in web development, but is not as good as Python in the field of data science; compared with Java, PHP performs worse in enterprise-level applications, but is more flexible in web development; compared with JavaScript, PHP is more concise in back-end development, but is not as good as JavaScript in front-end development.

PHP and Python each have their own advantages and are suitable for different scenarios. 1.PHP is suitable for web development and provides built-in web servers and rich function libraries. 2. Python is suitable for data science and machine learning, with concise syntax and a powerful standard library. When choosing, it should be decided based on project requirements.

PHP is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7


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