version_compare检查主要版本和次要版本

Question

I would like to have a function like PHP's version_compare() which let me compare version and consider minor/major version numbers.

My method should look like

function my_version_compare($new_version, $old_version, $operator, $only_minor = false){
    ...
    return (bool) $do_update;
}

a major version update is from 2.1 to 2.2 for instance while a minor is from 2.1 to 2.1.1

my_version_compare('2.2', '2.1', '>', false); //true
my_version_compare('2.2', '2.1', '>', true); //false
my_version_compare('2.1.1', '2.1', '>', false); //true
my_version_compare('2.1.1', '2.1', '>', true); //true

Basically I like to let the users decide if an auto update should be made on minor versions only or in any case

What I currently have works just with 2.x to 3.x updates:

function my_version_compare($new_version, $old_version, $operator, $only_minor = false){
    if($only_minor){
        return (bool) version_compare($new_version, $old_version, $operator)
                && !version_compare(intval($new_version), intval($old_version), $operator);
    }else{
        return (bool) version_compare($new_version, $old_version, $operator);
    }
}

Answer 1

After some fiddling I came up with this:

function my_version_compare($new_version, $old_version, $operator, $only_minor = false){

    $pos = 1; //position to indicate what's a major version (x.[x].x.x = 1)

    if($only_minor){

        //get parts as array and remove trailing zeros
        $new = explode(".", rtrim($new_version, ".0"));
        $old = explode(".", rtrim($old_version, ".0"));

        //check if it's a major version update
        $is_major_update = version_compare($new[$pos], $old[$pos], $operator) || version_compare(intval($new_version), intval($old_version), $operator);

        //check if it's a minor update
        $is_minor_update = (!$is_major_update && version_compare(strstr($new_version, '.'), strstr($old_version, '.'), $operator));

        return $is_minor_update;
    }

    return version_compare($new_version, $old_version, $operator);

}

Feel free to improve this snippet!