This article answers several key questions for beginners to learn PHP. First, the method to quickly get started with basic syntax is to practice basic structures such as variables, conditional judgment and loops, such as using $ to define variables, echo output content, and if judgment conditions; second, the way to use PHP and HTML is to embed PHP code into HTML, wrap it with <?php ... ?>, and pay attention to running in a server environment that supports PHP; third, the process of handling form submission and database connection includes: front-end submission of forms, PHP receives data, verifying data, using mysqli or PDO and other methods to connect to the database and perform insertion operations. At the same time, it is recommended to use ORM tools to improve security and convenience. The article emphasizes that learning PHP should focus on hands-on practice and gradually accumulate experience.
PHP is an old back-end language, and many people first came into contact with programming. Although various new languages are emerging one after another, PHP still occupies a place in the field of web development, especially the support of ecosystems such as WordPress and Laravel, which still makes its vitality strong.
If you are a newbie or want to systematically understand this language, this article will talk about some of your most concerned issues.
How to quickly get started with the basic PHP syntax?
The syntax of PHP is actually quite simple, very similar to C or JavaScript, especially infrastructure such as variables, conditional judgments and loops. for example:
Variables start with
$:$name = "Tom";-
Commonly used
echofor output content:echo "Hello, " . $name;
-
Conditional statements are also very intuitive:
if ($age >= 18) { echo "adult"; } else { echo "Minor"; }
It is recommended that you write a few small examples to practice your skills first, such as making a calculator, user login judgment, etc. Don’t put on too complicated frameworks from the beginning, and lay down the basic skills first.
How to use PHP and HTML together?
This is a problem that many newbies will encounter at the beginning. The most common use of PHP is to dynamically generate HTML pages. You can write PHP in the middle of HTML, for example:
<!DOCTYPE html> <html> <body> <?php $name = "World"; echo "<h1>Hello, $name</h1>"; ?> </body> </html>
This will allow you to display content dynamically on the page. A few points to note:
- The PHP code must be wrapped in
<?php ... ?> - When outputting HTML, you can use string splicing, or you can directly close the PHP tag and write HTML
- Don't forget that the server environment must support PHP, otherwise it will not work.
How to deal with form submission and database connection?
This is a basic operation of back-end development. For example, if you want to create a registration page, the process is roughly like this:
- Submit front-end HTML form to a PHP file
- PHP receives data (using
$_POSTor$_GET) - Do some verification of the data (such as whether it is empty or whether the email format is correct)
- Insert the database (usually using MySQL)
Let's give a simple example:
if ($_SERVER["REQUEST_METHOD"] == "POST") {
$email = $_POST["email"];
// Simple verification if (filter_var($email, FILTER_VALIDATE_EMAIL)) {
// Connect to the database $conn = new mysqli("localhost", "user", "pass", "mydb");
$stmt = $conn->prepare("INSERT INTO users (email) VALUES (?)");
$stmt->bind_param("s", $email);
$stmt->execute();
echo "Registered successfully!";
} else {
echo "The mailbox format is incorrect";
}
}In actual development, it is recommended to use PDO or ORM tools to operate the database, which is safer and more convenient.
Basically that's it. It is not difficult to learn PHP, the key is to do more hands-on and write more code. At the beginning, you may feel that the function name is strange and the error message is not understood. These are all processes. When you have written a few complete small projects, it will be smooth.
The above is the detailed content of A Simple Guide to PHP. For more information, please follow other related articles on the PHP Chinese website!
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