Learn PHP from scratch, how to get started quickly

PHP is a widely used server-side scripting language and one of the mainstream languages ​​​​for web development. PHP is a simple, easy-to-learn and use language, especially suitable for beginners. If you are interested in web development, then PHP is a good starting point. Let's take a look at how to learn PHP from scratch and how to get started quickly.

1. Preparation

First of all, you need to make sure that you have installed the PHP environment and the editing tools that suit you. For Windows users, you can use integrated environments such as WampServer or XAMPP. These integrated environments can not only quickly install and manage PHP environments, but also easily integrate web servers and databases such as Apache and MySQL. For Mac users, integrated environments such as MAMP are available.

For editing tools, you can use Sublime Text, Notepad, PHPStorm, etc., or your favorite editor. In the process of learning PHP, you can use the browser for debugging and testing.

2. Learn PHP basic syntax

The most basic syntax elements of PHP include variables, constants, operators, control structures and functions. Before learning PHP, you need to master basic HTML and CSS knowledge. PHP can be embedded into HTML tags and data can be output to the browser through output statements.

The following are some common syntax elements:

(1) Variable

$var = "Hello, PHP!";

In this example, $var is a variable, and its value is "Hello, PHP !". Variable names begin with the $ symbol, followed by the variable name. In PHP, variable names are not case-sensitive, but it is recommended to use lowercase letters.

(2) Constant

define('PI', 3.14);

In this example, PI is a constant and its value is 3.14. Constants refer to values ​​that cannot be modified once defined. It is recommended to use capital letters for constant names.

(3) Operator

PHP supports a variety of operators, including arithmetic operators, comparison operators, logical operators, etc. For example:

$a = 5;
$b = 3;
$c = $a + $b; // 算术运算符
$d = $a > $b; // 比较运算符
$e = $a && $b; // 逻辑运算符

(4) Control structure

In PHP, available control structures include if-else, for, while, do-while, switch, etc. For example:

if($a > $b){
echo "a > b";
}else{
echo "a <= b";
}

(5) Function

PHP has many built-in functions, such as strlen, substr, rand, date, etc. You can also create your own functions. For example:

function add($a, $b){
return $a + $b;
}

3. Learn PHP object-oriented programming

Object-oriented programming is a very important part of PHP, which can make the code more modular and maintainable. Before learning object-oriented programming, you need to master concepts such as classes, objects, properties, and methods.

The following is a simple example:

class Person{
private $name;
private $age;

public function __construct($name, $age){
    $this->name = $name;
    $this->age = $age;
}

public function sayHello(){
    echo "Hello, my name is " . $this->name . ", I'm " . $this->age . " years old.";
}
}
$person = new Person("Bob", 20);
$person->sayHello();

4. Learn PHP framework

The PHP framework allows you to develop Web applications more efficiently. Before learning the framework, you need to understand the concept of MVC.

MVC is the abbreviation of Model-View-Controller and is a commonly used design pattern. In MVC, Model is the part responsible for data processing and storage, View is the part responsible for displaying data, and Controller is the part responsible for coordinating the interaction between Model and View.

Common PHP frameworks include Laravel, CodeIgniter, etc. Before learning the framework, you need to master the basics of PHP and object-oriented programming.

5. Reference materials

PHP official documentation: http://php.net/manual/en/index.php

PHP learning website: https ://www.php.net/manual/zh/tutorial.php

PHP framework learning website: https://laravel.com/docs/5.8

This is a starting from scratch A simple guide to learning PHP, hope it helps. Learning PHP requires patience and perseverance, continuous practice and exploration. Finally, I wish you a happy study!

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