Mysqli - Prepared statements

PHP kode 

 class mysqliCon { 
     public $mysqli; 
     public $query;
     public $stmt;
     public $result;
 
 
     function __construct($type, $statement, $param = array()){
         // Connect to Database
         $this->mysqli = new mysqli("localhost", "root", "", "leg");
 
         //If no error occured making the connection
         if (!$this->mysqli->connect_error) {
             //set the statement
             $this->query = $statement;
             //check if statement isset // just a precortion
             if($this->query) {
 
                 //prepare the statement for execute
                 if ($this->stmt = $this->mysqli->prepare($statement)) {
                     //call bind_param with the right type variable, and as refrences 
                     call_user_func_array(array($this->stmt, "bind_param"), $this->refValues($param)); 
 
                     // if all is ok, execute the statement
                     if ($this->stmt->execute()){
                         //only if the statements is of the type SELECT return result
                         if($type == "select") {
                             $result = $this->stmt->get_result();
                             $this->result  = $result->fetch_array(MYSQLI_ASSOC); // this does work :)
                         }
                     } else{
                         error_log ("Didn't work");
                     }
                     //close my connection
                     $this->stmt->close();
                        
                 }
             }
         }
     }
 
     function returnResult() {
         // returns the result outside the class
         return $this->result;
     }
 
     function refValues($arr = array()){
         //check php version, and determine which type 
         if (strnatcmp(phpversion(),'5.3') >= 0) {
             //$keywords = array_keys($arr);
             //$tempArr = array();
             $valueType = "";
             for($i = 0; $i < sizeof($arr); $i++) {
                 if(gettype($arr[$i]) == "string") {
                     $valueType .= "s";
                 }else if(gettype($arr[$i]) == "integer") {
                     $valueType .= "i";
                 }else if(gettype($arr[$i]) == "double") {
                     $valueType .= "d";
                 }
             }
 
             foreach($arr as $index => &$value) {
                 // Set values as references.. Do not! do this at home! foreach & references are evil!
                 $arr[$index] = &$value;
             }
             array_unshift($arr, $valueType);
             //print_r($arr);
             //return $arr;
         }
         return $arr;
     }
 }