📅 最后修改于: 2023-12-03 15:13:08.693000 🧑 作者: Mango
PHP is a widely-used, open-source scripting language that is suited for web development and can be embedded into HTML. It is a server-side language that can dynamically generate web pages, process forms and manage databases.
Some of the key features of PHP include:
Easy to learn: PHP has a simple and easy-to-understand syntax that is similar to other programming languages such as C and Java.
Interpreted: PHP is an interpreted language which means that the code is executed line-by-line instead of being compiled first.
Platform independent: PHP can run on multiple platforms including Windows, Linux, Mac OS X and more.
Object-oriented: PHP supports object-oriented programming (OOP), making it easier to write complex code and maintain.
Integrated with databases: PHP has built-in support for the most popular databases including MySQL, Oracle, Postgres and more.
Large community: PHP has a large and active community of developers who contribute to its development and provide support.
Here are some examples of how PHP can be used in web development:
<?php
// Connect to database
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";
$conn = mysqli_connect($servername, $username, $password, $dbname);
// Check connection
if (!$conn) {
die("Connection failed: " . mysqli_connect_error());
}
// Create table in database
$sql = "CREATE TABLE MyGuests (
id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
firstname VARCHAR(30) NOT NULL,
lastname VARCHAR(30) NOT NULL,
email VARCHAR(50),
reg_date TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
)";
if (mysqli_query($conn, $sql)) {
echo "Table MyGuests created successfully";
} else {
echo "Error creating table: " . mysqli_error($conn);
}
mysqli_close($conn);
?>
This code connects to a database and creates a new table called MyGuests with columns for first name, last name, email and a timestamp.
<!DOCTYPE html>
<html>
<body>
<?php
$x = 5;
$y = 10;
$z = $x + $y;
echo "The sum of " . $x . " and " . $y . " is " . $z;
?>
</body>
</html>
This code embeds PHP within HTML and calculates the sum of two numbers.
PHP is a popular scripting language that is widely used in web development. Its easy-to-learn syntax and object-oriented features make it a great choice for building dynamic web pages and managing databases. With a large and active community, there are many resources available for learning and getting started with PHP.