Delos MVC PHP Framework

I've been working in PHP since almost three years ago. In this time I built a framework as base for my projects.

I want it to be improved, and which other best option there are that use StackExchange?, so I decided to post this here.

The framework is hosted in GitHub: https://github.com/CPedrini/Delos

Now, the problem: I think that there is a mess in the Input class, particularly in how the base's query string is parsed, I have problems to make a definitely decision of how manage URI's parameters.

I've created a .htaccess, which rewrites the URI like this:

From this: 127.0.0.1/home/initialize/param1:value1/param2:value2

To this: 127.0.0.1/index.php?p=home/initialize/param1:value1/param2:value2

Obviously, this is not needed, it's just a fancy stuff. If mod_rewrite is disabled then all the links on the web must be changed to the rewritten form.

So, in input class constructor the query string p is parsed.

I explode the $_GET['p'] var with separation slashes and delete empty values.

Then if first value doesn't contain a : char I store it in $_GET['section'] var, it will be the control to be instantiated.

Then, if section was there, in the second exploded value, if there isn't a : char then this is the method of the control to be called. I store it in $_GET['method'].

Finally, all the others stripped vars are parsed and stripped with the : char. In the previous example, to this:

$_GET['param1'] = value1

Do you guys think that it's uniform? What changes do you suggest?

EDIT: Added code in question.

$a = explode('/', $_GET['p']);

foreach ($a as $key => $value) {
    if($value == ''){
        unset($a[$key]);
    }
}

$b = 0;

if(isset($a[0]) && !strstr($a[0],':')){
    $_GET['section'] = $this->security->sanitize($a[0]);
    $b+=1;

    if(isset($a[1]) && !strstr($a[1],':')){
         $_GET['method'] = $this->security->sanitize($a[1]);
         $b+=1;
    }
}

if(isset($a[$b])){
    for($b = $b; $b < count($a); $b ++){
        if(!strstr($a[$b],'method') && !strstr($a[$b],'section')){

            $c = explode(':',$a[$b]);
            $_GET[$this->security->sanitize($c[0])] = isset($c[1]) ? $this->security->sanitize($c[1]) : '';
        }
    }
}
unset($_GET['p']);