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private function bindVars（$stmt,$params） {if （$params ！= null） {$types = ""; //initial sting with typesforeach（$params as $param） { //for each element, determine type and addif（is_int（$param）） {$types .= "i"; //integer} elseif （is_float（$param）） {$types .= "d"; //double} elseif （is_string（$param）） {$types .= "s"; //string} else {$types .= "b"; //blob and unknown}}$bind_names[] = $types; //first param needed is the type string // eg: "issss"for （$i=0; $i<count（$params）;$i++） { //go through incoming params and added em to array$bind_name = "bind" . $i; //give them an arbitrary name$$bind_name = $params[$i]; //add the parameter to the variable variable$bind_names[] = &$$bind_name; //now associate the variable as an element in an array}//call the function bind_param with dynamic paramscall_user_func_array（array（$stmt,"bind_param"）,$bind_names）;}return $stmt; //return the bound statement