php-makephar/props.php

<?php

function app_version() {
    $ver = exec("git describe --tags");
    $ver = explode("-",$ver);
    if (count($ver)>1) {
        $ver = array_slice($ver,0,2);
    }
    return join(".",$ver);
}

printf("%s=%s\n", "APP_VERSION", app_version());