PHP - PHP: Hypertext Preprocessor

Syntax Overview

1$x = 10;

1function functionName(parameters) { }

1class ClassName { }

1// Single line or /* Multi-line */

Code Examples and Tutorials

Learning PHP programming requires hands-on practice with real code examples. Below, you'll find comprehensive code samples that demonstrate fundamental concepts, common programming patterns, and practical implementations. Each example is carefully explained to help you understand not just what the code does, but why it's written that way and how you can adapt it for your own projects.

1<?php
2echo "Hello, World!";
3?>

1$age = 25;
2$price = 19.99;
3$name = "John";
4$isActive = true;
5$numbers = [1, 2, 3, 4, 5];

1function add($a, $b) {
2    return $a + $b;
3}
4
5$result = add(5, 3);
6echo "Sum: " . $result;

1class Person {
2    public $name;
3    public $age;
4    
5    public function __construct($name, $age) {
6        $this->name = $name;
7        $this->age = $age;
8    }
9    
10    public function display() {
11        echo $this->name . " is " . $this->age . " years old";
12    }
13}
14
15$person = new Person("John", 25);
16$person->display();

1// For loop
2for ($i = 0; $i < 10; $i++) {
3    echo $i;
4}
5
6// Foreach loop
7$numbers = [1, 2, 3, 4, 5];
8foreach ($numbers as $num) {
9    echo $num;
10}

1$age = 18;
2
3if ($age >= 18) {
4    echo "Adult";
5} else {
6    echo "Minor";
7}

Essential PHP Commands and Functions

Understanding the essential commands and functions in PHP is crucial for effective programming. This section provides detailed explanations of the most important commands, functions, and language features you'll use regularly when developing applications with PHP. Each command is explained with its purpose, syntax, and practical usage examples to help you master the language quickly.

1echo "Hello";

1$name = 'John';

1function myFunc() { }

1class MyClass { }

1<?php echo 'Hello'; ?>

1include 'file.php';

Learning PHP Programming

Common Use Cases

PHP is widely used across various industries and application domains. Understanding where and how PHP is typically used helps you make informed decisions about when to choose this language for your projects. Below are the most common use cases where PHP excels, along with examples of real-world applications built with this powerful programming language.

Best Practices and Coding Standards

Following best practices is essential for writing professional, maintainable PHP code. These guidelines have been developed by the programming community over years of experience and help ensure your code is readable, efficient, and follows industry standards. Adopting these practices early in your PHP learning journey will make you a better developer and help you write code that others can easily understand and maintain.