Newer PHP versions come with more features and improvements while deprecating some obsolete features. Old PHP codes might not work with more recent PHP versions and vice versa. It is, therefore, essential to use the correct PHP version for your code.

You can check the PHP version on your system by running the php command from the command line. There are also some PHP functions that you can use in your code to get the PHP version during runtime.

php binary is available in default PATH variable for Ubuntu and other Linux variance if installed using the default package manager. You might need to use full path for the binary if it's manually installed or using other methods such as XAMPP for Windows.

Steps to check installed PHP version:

  1. Run php -v from the command line.
    $ php -v
    PHP 7.4.3 (cli) (built: May 26 2020 12:24:22) ( NTS )
    Copyright (c) The PHP Group
    Zend Engine v3.4.0, Copyright (c) Zend Technologies
        with Zend OPcache v7.4.3, Copyright (c), by Zend Technologies
  2. Run php -i from the command line.
    $ php -i | grep "PHP Version"
    PHP Version => 7.4.3
    PHP Version => 7.4.3
  3. Print PHP_VERSION_ID from PHP script.
    <?php 
    	echo PHP_VERSION_ID;
    	//Sample output: 70403
    ?>
  4. Print phpversion() output from PHP script.
    <?php 
    	echo phpversion();
    	//Sample output: 7.4.3
    ?>
  5. View from phpinfo() output.
    <?php 
    	phpinfo();
    ?>

  6. Query your package manager where the PHP packages are installed from.
    $ apt show php
    Package: php
    Version: 2:7.4+75
    Priority: optional
    Section: php
    Source: php-defaults (75)
    Origin: Ubuntu
    Maintainer: Ubuntu Developers <ubuntu-devel-discuss@lists.ubuntu.com>
    Original-Maintainer: Debian PHP Maintainers <team+pkg-php@tracker.debian.org>
    Bugs: https://bugs.launchpad.net/ubuntu/+filebug
    Installed-Size: 13.3 kB
    Depends: php7.4
    Download-Size: 2,712 B
    APT-Sources: http://jp.archive.ubuntu.com/ubuntu focal/main amd64 Packages
    Description: server-side, HTML-embedded scripting language (default)
     PHP (recursive acronym for PHP: Hypertext Preprocessor) is a widely-used
     open source general-purpose scripting language that is especially suited
     for web development and can be embedded into HTML.
     .
     This package is a dependency package, which depends on latest stable
     PHP version (currently 7.4).

    Package manager query comand for different operating systems and distributions:

    Platform Command
    homebrew $ brew list --versions php
    Debian, Ubuntu $ apt show php
    CentOS, RedHat, Fedora$ dnf info httpd
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