password reset, admin upadte and Camel case update

Backend/Controllers/Group/Group.php

@@ -6,10 +6,11 @@ use Backend\Models\Password;
 
 /**
  * @param string $token
- * @return Group;
+ * @return Group|null ;
  */
 
-function groupViaToken(string $token){
+function groupViaToken(string $token): ?Group
+{
 
     if($password = Password::firstWhere('remember_token', $token)){
         return Group::find($password->group_id);
@@ -17,6 +18,28 @@ function groupViaToken(string $token){
     return null;
 }
 
+/**
+ * @return bool
+ */
 function isLogin(){
     return isset($_SESSION["token"]);
+}
+
+/**
+ * @param string $password1
+ * @param string $password2
+ * @return bool
+ */
+function passwordValidate(string $password1, string $password2 ){
+    if($password1 === $password2){
+        $uppercase = preg_match('@[A-Z]@', $password1);
+        $lowercase = preg_match('@[a-z]@', $password1);
+        $number    = preg_match('@[0-9]@', $password1);
+        $specialChars = preg_match('@[^\w]@', $password1);
+
+        if(!$uppercase || !$lowercase || !$number || !$specialChars || (strlen($password1) < 8 && strlen($password1) > 255)) {
+            return true;
+        }
+    }
+    else false;
 }