Get latest git tag version with PHP.

gitVersion.php

<?php

if (! function_exists('git_version')) {
    /**
     * Get latest git tag version.
     *
     * @return string
     */
    function git_version()
    {
        $gitCommand = 'git describe --tags $(git rev-list --tags --max-count=1)';

        if (class_exists('Symfony\Component\Process\Process')) {
            $process = (new Symfony\Component\Process\Process($gitCommand))->run();

            return trim($process->getOutput());
        }

        return trim(exec($gitCommand));
    }
}