Getting Started with PHP: Windows Server

This article aims to introduce beginners to how to learn and use PHP on Windows servers. PHP is a simple and easy-to-learn programming language that is widely used in the development of web applications. Whether you have programming experience or not, this article will help you learn how to get started with PHP.

Install PHP and Web Server

To use PHP on a Windows server, you need to install PHP and Web server. Here are the steps to install PHP and a web server on Windows:

1. Download PHP. The latest version of PHP can be downloaded from the official website https://windows.php.net/download/.
2. Install the web server. It is recommended to use the Apache web server. You can download the Apache Web server from the Apache official website https://httpd.apache.org/download.cgi. The installation steps are similar to other Windows programs.
3. Set up PHP and Apache. Find the php.ini file in the PHP installation directory, open it and uncomment the following line:

extension_dir = "ext"
extension=php_mysql.dll
extension=php_mysqli.dll

At the same time, add the following lines in the LoadModule section of Apache's configuration file httpd.conf:

LoadModule php5_module "D:/php/php5apache2_4.dll"
AddHandler application/x-httpd -php .php
PHPIniDir "D:/php"

The purpose of the above content is to tell the Apache server which PHP interpreter and PHP expansion and loading. Please make corresponding modifications according to your actual installation path.

4. Test PHP and Apache. Create a file named "index.php" in the root directory of Apache and copy the following content into the file:

phpinfo();
?>

Enter "http://localhost/index.php" in the browser. If the PHP information is successfully displayed, it means that both PHP and Apache have been successfully installed.

Learn PHP basic syntax

After you understand how to set up PHP and Web servers, you can start to learn the basic syntax of PHP. Here is some basic syntax:

1. Variables: In PHP, variables start with "$". For example: $name = "John";
2. Output: In PHP, use echo or print statements to output content. For example: echo "Hello World!";
3. String: In PHP, use double quotes or single quotes to define strings. For example: $name = "John"; or $name = 'John';
4. Array: In PHP, use the array() function to define an array. For example: $colors = array("red", "green", "blue");
5. Conditional statements: In PHP, use if...else statements for conditional judgment. For example:

if($age < 18){

echo "You are too young to drive.";

}else{

echo "You can drive!";

}

6. Loop statement: In PHP, use for, while, do...while loop statements to loop. For example:

for($i=0;$i<10;$i ){

echo $i;

}

7. Function: In PHP, Use the function keyword to define functions. For example:

function add($a, $b){

return $a + $b;

}

Use PHP to connect to MySQL database

In a Web application In development, the database is crucial. MySQL is a popular open source relational database and it is very easy to use MySQL with PHP. The following are the steps to connect to a MySQL database:

1. Download and install MySQL. You can download the latest version of MySQL Community Server from the MySQL official website https://dev.mysql.com/downloads/mysql/.
2. Create database and tables. In MySQL, databases and tables are created using CREATE DATABASE and CREATE TABLE statements.
3. Connect to MySQL in PHP. Use the mysqli_connect() function in PHP to connect to MySQL. For example:

$conn = mysqli_connect("localhost", "username", "password", "database");

where "localhost" is the address of the MySQL server, "username" is the MySQL username, "password" is the MySQL password, and "database" is the name of the database to be connected.

4. Execute SQL statements. Use the mysqli_query() function in PHP to execute SQL statements. For example:

$query = "SELECT * FROM users";
$result = mysqli_query($conn, $query);

5. Process the returned results. Use the mysqli_fetch_array() function in PHP to process the returned result set. For example:

while($row = mysqli_fetch_array($result)){

echo $row['name'];

}

This article only introduces the introductory knowledge of PHP and the use of MySQL database . Both PHP language and MySQL database are widely used in web application development. Learning these basic knowledge can help you better understand web development. During the learning process, continuous practice and practice are required to truly master this knowledge.

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