Convert the result of adoption in the language

The output of the http_accept variable is a mess, I can’t work with it, I need to convert it to an array like this:

Array
(
    [en-ca] => 1
    [pt-pt] => 0.4
    [de] => 0.2
);

Hope you guys can help me.

EDIT:

Here is the code that will determine the preferred language of the client, this is a quick way to guess the language of the user:

I thought of all the Spanish and Portuguese visitors, there are some substrates in the middle, because pt-BR or pt-PT will use the same language files, the same for es-ES and es-CO for example.

<?php
// detectar idioma
$linguagens = $_SERVER['HTTP_ACCEPT_LANGUAGE'];
$parcelas = explode(',', $linguagens);
$linguas_aceites = array();

foreach ($parcelas as $lingua) {
        $contagem = preg_match('/([-a-zA-Z]+)\s*;\s*q=([0-9\.]+)/', $lingua, $matches);
        if ($contagem === 0)
           $linguas_aceites[substr($lingua, 0, 2)] = 1;
        else
           $linguas_aceites[substr($matches[1], 0, 2)] = $matches[2];
}

foreach ($linguas_aceites as $key => $val) { 
      if(substr($key, 0, 2) == "pt"){
        echo "Portugues e preferido aqui";}
}   

?>

This is not possible without the help of Aif (Many thanks for the original code!):

<?php

    $al = 'en-US,en;q=0.8,pt-PT;q=0.6';
    $values = explode(',', $al);

    $accept_language = array();

    foreach ($values AS $lang) {
            $cnt = preg_match('/([-a-zA-Z]+)\s*;\s*q=([0-9\.]+)/', $lang, $matches);
            if ($cnt === 0)
               $accept_language[$lang] = 1;
            else
               $accept_language[$matches[1]] = $matches[2];
    }

    print_r($accept_language);
?>