Compare two version strings in PHP

Question

How to compare two strings in version format? such that:

version_compare(\"2.5.1\",  \"2.5.2\") => -1 (smaller)
version_compare(\"2.5.2\",  \"2.5.2\") =&         


        

Answer 1

I have developed this function. I hope it helps. It can go to any length.

function updateAppVersion($appVersion1, $appVersion2)
{
    $releaseVersion = explode(".",$appVersion1);
    $deviceVersion = explode(".",$appVersion2);

    $len = count($deviceVersion);
    if(count($releaseVersion)>count($deviceVersion)){
        $len = count($releaseVersion);
    }

    for($i = 0;$i<$len;$i++){
        echo "[i=".$i."][r=".$releaseVersion[$i]."][d=".$deviceVersion[$i]."]";
        if(!isset($releaseVersion[$i])){
            return false;
        }
        else if(!isset($deviceVersion[$i])){
            return true;
        }
        else if($releaseVersion[$i]>$deviceVersion[$i]){
            return true;
        }
        else if($releaseVersion[$i]<$deviceVersion[$i]){
            return false;
        }

    }

    return false;
}