How to check whether php is installed correctly (multiple methods introduced)

For users who want to install PHP, it is very important to know how to check whether PHP is installed correctly. Because if PHP is not installed successfully, then all PHP scripts will not run properly. In this article, we will introduce how to check whether PHP is installed correctly.

1. Check the PHP version number

Enter the following command in the terminal or command line, and the PHP version number installed on your computer will be displayed.

php -v

If PHP is installed correctly, you will see output similar to the following:

PHP 7.4.10 (cli) (built: Jul 28 2020 16:20:29) ( NTS )
Copyright (c) The PHP Group
Zend Engine v3.4.0, Copyright (c) Zend Technologies

If you see an error message, you need to install PHP before you can use it.

2. Write a Hello World script in PHP

Create a new file, name it index.php, and then write the following code:

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

After saving, place the file in the root directory of the web server (for example: /var/www/html). You can then access the file by entering http://localhost/index.php in your web browser's address bar.

If the message Hello, World! is displayed in the browser, it means that PHP has been installed and configured correctly.

3. Check PHP module

Under Linux system, you can use the following command to view the PHP module and its location:

php -m

This will display List of all PHP modules you have installed.

Under Windows system, you can open the php.ini file in the PHP installation directory and make sure the following modules are enabled:

extension=php_gd2.dll
extension=php_mbstring.dll
extension=php_mysql.dll

If you find some The modules are not enabled, you can enable them by following the steps below:

a. Open the php.ini file;

b. Search for relevant modules;

c . Enable or disable modules by preceding the line with a semicolon (;) or removing the semicolon (;).

Successful installation of PHP is one of the important foundations of web development. It allows you to use and run PHP scripts, create and manage databases, and use web servers such as Apache. By following the steps above to see if you have PHP installed correctly, you can quickly apply the PHP features you need in web development.

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