Beginner's Guide to PHP CLI Programming

PHP CLI Programming Getting Started Guide

With the development of the Internet, more and more developers are beginning to use the PHP language for Web development. The PHP CLI is also a very important technology in the PHP language. It allows you to run PHP scripts in the command line window without running it in the browser. This article will introduce the basic knowledge and usage of PHP CLI.

1. Introduction to PHP CLI

PHP CLI is a command line interface for the PHP language. Its function is to run PHP scripts without the need for a Web server environment. PHP CLI provides a fast and convenient way to execute PHP scripts in the command line window.

Unlike traditional web development environments, PHP CLI allows you to better manage and write PHP scripts. It also provides you with the ability to fully control PHP applications without being restricted by the web server.

2. Install PHP CLI

If you want to use PHP CLI for programming, you must first install PHP CLI on your computer. PHP CLI can be downloaded from the PHP official website.

1. Download PHP CLI

Download the latest version of PHP CLI from the PHP official website (https://www.php.net/downloads). Choose a version suitable for your operating system to download and install. For example, if you are using a Windows operating system, select a Windows version of PHP CLI from the download page.

2. Installing PHP CLI

In Windows operating systems, installing PHP CLI is very simple. After downloading, double-click the installation package and follow the prompts to install it. In Linux operating systems, PHP CLI can be installed through the terminal.

3. PHP CLI Programming Basics

Understanding how to use PHP CLI to write command line-based programs is a very important step. Here are some basics of PHP CLI programming.

1. Writing PHP Scripts

Before you start writing PHP scripts, you need to create a PHP file. It can be edited using any text editor and saved as a file ending in .php.

For example, create a file called hello.php and add the following content in it:

<?php
echo "Hello World!";
?>

2. Run the script

Run the PHP CLI script It's very simple. You just need to enter the installation directory of PHP CLI through the command line, and then enter the following command to run:

php /path/to/hello.php

/path/to/hello.php is the path to the hello.php you just wrote. In the command line window, after entering the above command, you will see the output of "Hello World!".

3. Command Line Parameters

PHP CLI allows you to pass parameters to scripts on the command line. Here is a simple example:

<?php
$arg1 = $argv[1];
echo "Hello, $arg1!";
?>

In the above example, the $argv variable is used to accept the arguments passed to the script. Parameters can be passed in the command line in the following ways:

php /path/to/hello.php John

The above command will pass the parameter "John" to the hello.php script and output the result of "Hello, John!"

4. Interactive Mode

In addition to running scripts from files, the PHP CLI also supports interactive mode. In interactive mode, you can enter PHP code directly into the command line. Try the following:

1. Enter PHP CLI command line mode:

php -a

2. Enter the following at the command line:

echo "Hello World!";

3. Press the "enter" key and wait for the PHP CLI to output the results.

The above command outputs the result of "Hello World!".

4. Ending

The above is the content of the PHP CLI Getting Started Guide. Using the PHP CLI allows you to better manage and write PHP scripts, and develop more conveniently while being isolated from the web server. I hope this article will be helpful to your study. If you want to learn PHP CLI in depth, it is recommended to check out more documentation and tutorials in php.net.

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