PHP Exercises : Compare the PHP version

Last update on April 19 2025 11:49:43 (UTC/GMT +8 hours)

23. Compare PHP Version

Write a PHP script to compare the PHP version.

Note : Use version_compare() function and PHP_VERSION constant.

Sample Solution:

PHP Code:


<?php
// Check if PHP version is at least 6.0.0
if (version_compare(PHP_VERSION, '6.0.0') >= 0) {
    echo 'I am at least PHP version 6.0.0, my version: ' . PHP_VERSION . "\n";
}

// Check if PHP version is at least 5.3.0
if (version_compare(PHP_VERSION, '5.3.0') >= 0) {
    echo 'I am at least PHP version 5.3.0, my version: ' . PHP_VERSION . "\n";
}

// Check if PHP version is at least 5.0.0
if (version_compare(PHP_VERSION, '5.0.0', '>=')) {
    echo 'I am using PHP 5, my version: ' . PHP_VERSION . "\n";
}

// Check if PHP version is less than 5.0.0
if (version_compare(PHP_VERSION, '5.0.0', '<')) {
    echo 'I am using PHP 4, my version: ' . PHP_VERSION . "\n";
}
?>

Explanation:

Check PHP Version 6.0.0 or Higher:

The version_compare() function compares the current PHP version (PHP_VERSION) with '6.0.0'.
If the current version is at least 6.0.0, it echoes a message stating that the version is 6.0.0 or higher.

Check PHP Version 5.3.0 or Higher:

A similar version_compare() check is performed for '5.3.0'.
If the current version is at least 5.3.0, it echoes a message confirming this along with the current version.

Check if Using PHP 5:

The code checks if the current version is at least 5.0.0 using version_compare() and echoes a message indicating that PHP 5 is being used.

Check for PHP Version Less than 5.0.0:

Finally, the code checks if the current version is less than 5.0.0.
If true, it echoes a message indicating that PHP 4 is being used.

Output of Current Version:

Each condition outputs the current PHP version using the predefined constant PHP_VERSION.

Output:

I am at least PHP version 6.0.0, my version: 7.0.15-0ubuntu0.16.04.4
I am at least PHP version 5.3.0, my version: 7.0.15-0ubuntu0.16.04.4
I am using PHP 5, my version: 7.0.15-0ubuntu0.16.04.4

Flowchart:

For more Practice: Solve these Related Problems:

Write a PHP script to compare the current PHP version with a target version and output a compatibility report.
Write a PHP script to check version compatibility for multiple PHP modules using version_compare().
Write a PHP script to trigger an upgrade suggestion if the PHP version is below a predefined threshold.
Write a PHP script to compare two version strings obtained from different sources using version_compare() and display the result.

PHP Code Editor:

Have another way to solve this solution? Contribute your code (and comments) through Disqus.

Previous: Write a PHP script to get the full URL.
Next: Write a PHP script to get the name of the owner of the current PHP script.