Select cookie value based on string match

Question

So I have this if statement where I am looking for a cookie:

if (isset($_COOKIE['OptanonConsent'])) {
   ...
}

Next, I'm breaking the cookie up using the explode function:

$cookie_array = explode("&", $_COOKIE['OptanonConsent']);

Which gives me the following output:

array(9) { 
   [0]=> string(26) "landingPath=NotLandingPage" 
   [1]=> string(67) "datestamp=Tue+Apr+12+2022+07:16:23+GMT-0500+(Central+Daylight+Time)" 
   [2]=> string(14) "version=6.33.0" 
   [3]=> string(30) "groups=C0001:1,C0002:0,C0004:0" 
   [4]=> string(6) "hosts=" 
   [5]=> string(14) "isGpcEnabled=0" 
   [6]=> string(13) "geolocation=;" 
   [7]=> string(17) "isIABGlobal=false" 
   [8]=> string(23) "AwaitingReconsent=false" 
}

---

Next, I want to filter through and just grab the array index that has "groups" in it, using the following:

$groups_array = array_filter($cookie_array, static function($value) {
    return str_contains($value, 'groups');
});

Which outputs:

array(1) { 
  [3]=> string(30) "groups=C0001:1,C0002:0,C0004:0" 
}

---

Next, I want to search and see if "C0004:0" exists, so I'm using:

$targeting_cookie_disabled = in_array('C0004:0', $groups_array, true);

But that is returning a false return. The index changes always, so I can't use $groups_array[3].

---

Does anyone know how to properly break up the cookie and grab just the "groups" index of an array and search through it?