not entering db

hello guys i've been battling with this no show my data can't get into the database it just prints the else part of my function

karose-services_db.php

error_reporting( E_ALL & ~E_DEPRECATED & ~E_NOTICE );

$servername = "localhost";
$username = "root";
$password = "";
$db= "karose-services_db";


register.php

<?php
/**
 * Created by IntelliJ IDEA.
 * User: Karachi
 * Date: 10/29/2017
 * Time: 7:14 AM
 */


require_once 'karose-services_db.php';


error_reporting(E_ALL); ini_set('display_errors', 1);
session_start();

if(isset($_SESSION['user_id'])) {
    header("Location: index.php");
}


/**
 * validate form
 * @return boolean return true if no error found, otherwise return false
 */
$errors= array();
$firstname='';
$lastname='';
$email='';
$mobile='';
$c_name='';
$s_experience='';
$t_size='';
$m_turnover='';
$a_details='';
$services='';
$o_services='';
$city='';
$o_city='';
$s_location='' ;

function validate_form(){
    global $firstname,$lastname,$email,$mobile,$c_name,  $s_experience,  $t_size,$m_turnover,
           $a_details,$services,$o_services,$city,$o_city,$s_location,$errors ;

    if(isset($_POST['txtfirstname'])!=''){
        $firstname= filter_var($_POST['txtfirstname'], FILTER_SANITIZE_STRING);

    if ($firstname==''){
        $errors[]="hey! name is required";
      }
    }else{
        $errors[]="you must enter your name";
    }

    if(isset($_POST['txtlastname'])!=''){
        $lastname= filter_var($_POST['txtlastname'], FILTER_SANITIZE_STRING);
    if ($lastname==''){
        $errors[]="hey! name is required";
     }
    }else{
        $errors[]="you must enter your name";
    }

    if(isset($_POST['txtemail']) !=''){
        $email= filter_var($_POST['txtemail'], FILTER_SANITIZE_STRING);
        if( !filter_var($email, FILTER_VALIDATE_EMAIL)){
                $errors[]='email is not valid';
        }
    }else{
        $errors[]='please email is required';
    }

    if(isset($_POST['txtmobile'])!=''){
        $mobile= filter_var($_POST['txtmobile'],FILTER_SANITIZE_NUMBER_INT);
        if($mobile==''){
            $errors[]='please enter your number';
        }
    }else{
        $errors[]='enter valid number';
    }

    if(isset($_POST['txtcompany'])!=''){
        $c_name= $_POST['txtcompany'];
    }else{
        $errors[]='please enter company name';
    }

    if(isset($_POST['selexperience' ])!=''){
        $s_experience=$_POST['selexperience'];
    }else{
        $errors[]= ' please select one';
    }

    if(isset($_POST['selteamsize'])!=''){
       $t_size= $_POST['selteamsize'];
    }else{
        $errors[]=' please select one';
    }

    if(isset($_POST['selmon_turnover'])!=''){
        $m_turnover=$_POST['selmon_turnover'];
    }else{
        $errors[]='please select one ';
    }

    if(isset($_POST['additional_details'])!=''){
        $a_details= filter_var($_POST['additional_details'], FILTER_SANITIZE_STRING);
        if($a_details==''){
            $errors[]='please enter valid information or contact us ';
        }
    }

    if(isset($_POST['selservices[]'])){
        $services=$_POST['selservices[]'];
    }
    if(isset($_POST['txtotherservice']) !=''){
        $o_services=filter_var($_POST['txtotherservice'], FILTER_SANITIZE_STRING);
        if($o_services== $services){
            $errors[]='please enter valid information';
        }else{
            $errors[]='please enter valid information or contact us ';
        }
    }

    if(isset($_POST['selcity[]']) !=''){
        $city= $_POST['selcity[]'];
        if($city==''){
            $errors[]='enter something valid';
        }
    }

    if(isset($_POST['txtothercity']) !=''){
        $o_city= filter_var($_POST['txtothercity'], FILTER_SANITIZE_STRING);
        if($o_city==''){
            $errors[]='check what you entered';
        }
    }

    if(isset($_POST['txtotherlocation'])!=''){
        $s_location= filter_var($_POST['txtotherlocation'],FILTER_SANITIZE_STRING );
        if ($s_location){
            $errors[]='please enter something right';
        }
    }

    if(count($errors)){
        return false;
    }else{
        return true;
    }
}

var_dump(validate_form());

//function display_value($fieldName){
//    echo isset($_POST[$fieldName]) ? $_POST[$fieldName] : '';
//}

function insert_user($firstname,$lastname,$email,$mobile,$c_name,  $s_experience,  $t_size,$m_turnover,
                     $a_details,$services,$o_services,$city,$o_city,$s_location){
    global $dbh, $msg;


    echo "here{$GLOBALS['dbh']}";
    // construct SQL insert statement
    $sql_insert = "INSERT INTO partners(firstname, lastname, mail, mobilenumber, companyname,experience, teamsize, monthlyturnover,qualifications,servicesprovided, anotherservice, city, anothercity, specificareas)
				   VALUES(" . $dbh->quote($firstname) .", " . $dbh->quote( $lastname) . ", " . $dbh->quote($email) . ", " . $dbh->quote($mobile) . ", " . $dbh->quote($c_name) . ", " . $dbh->quote($s_experience) . ", " . $dbh->quote($t_size) . ", " . $dbh->quote($m_turnover) . ", " . $dbh->quote($a_details) . ", " . $dbh->quote($services) . ",
 " . $dbh->quote($o_services) . ", " . $dbh->quote($city) . ", " . $dbh->quote($o_city) . ", " . $dbh->quote($s_location) . ")";

    if($dbh->exec($sql_insert) === false){
        $msg = 'Error inserting the partner.';
        return false;
    }else{
        $msg = "The new partner  is created";
        return true;
    }
}

function start_form(){

    // if user submitted the form
    if(isset($_POST['btncreatepartner']))
    {
        // validate form
        if(validate_form())
        {
            require_once 'karose-services_db.php';

                $dsn = "mysql:host=$servername;dbname=$db";
                try {
                    // create database connection
                     new PDO($dsn, $username, $password);
                    insert_user(firstname, lastname, mail, mobilenumber, companyname,experience, teamsize, monthlyturnover,qualifications,servicesprovided, anotherservice, city, anothercity, specificareas);

                } catch (PDOException $e) {
                    echo $e->getMessage();
                }
        }
    }else{
        echo 'error ';
    }
}

 start_form();