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Form not submitted into database.

Hello can anybody check any mistakes in my coding? i tried to create a submission form, everything looks fine, no error message, but when i fill all details any try to submit it, it redirect to same page without appearing any successful message, and the data do not insert into phpmyadmin database. here's my coding

<?php session_start(); if ($_SESSION['login_user'] == "") header("Location:logout.php"); include('database.php'); ?> <!-- Iridium by TEMPLATED templated.co @templatedco Released for free under the Creative Commons Attribution 3.0 license (templated.co/license) --> <html> <head> <title>Booking</title> <meta http-equiv="content-type" content="text/html; charset=utf-8" /> <meta name="description" content="" /> <meta name="keywords" content="" /> <link href='http://fonts.googleapis.com/css?family=Arimo:400,700' rel='stylesheet' type='text/css'> <link href='http://fonts.googleapis.com/css?family=Roboto+Condensed|Open+Sans+Condensed:300' rel='stylesheet' type='text/css'> <!--[if lte IE 8]><script src="js/html5shiv.js"></script><![endif]--> <script src="http://ajax.googleapis.com/…/li…/jquery/1.11.0/jquery.min.js"></script> <script src="js/skel.min.js"></script> <script src="js/skel-panels.min.js"></script> <script src="js/init.js"></script> <noscript> <link rel="stylesheet" href="css/skel-noscript.css" /> <link rel="stylesheet" href="css/admin_style.css" /> <link rel="stylesheet" href="css/style-desktop.css" /> </noscript> <!--[if lte IE 8]><link rel="stylesheet" href="css/ie/v8.css" /><![endif]--> <!--[if lte IE 9]><link rel="stylesheet" href="css/ie/v9.css" /><![endif]--> </head> <body> <!-- Header --> <div id="header"> <div class="container"> <!-- Logo --> <div id="logo"> <h1>R & G</h1> <span>Click & Drive</span> </div> <!-- Nav --> <nav id="nav"> <ul> <li><a href="homepage_admin.php">Homepage</a></li> <li class="active"><a href="addcar_admin.php">Add Car</a></li> <li><a href="changepassword_admin.php">Change Password</a></li> <li><a href="addadmin_admin.php">Add Admin</a></li> <li><a href="checkbooking_admin.php">Check Booking</a></li> <li><a href="logout.php">Log Out</a></li> </ul> </nav> </div> </div> <!-- Main --> <div id="main"> <div class="container"> <link rel="stylesheet" href="css/admin_style.css" /> <div class="row"> </div> <!-- Content --> <!--<div id="content" class="11u skel-cell-important">--> <section> <script src="js/scriptimage.js"></script> <link rel="stylesheet" href="css/style_admin.css" /> </section> <!--<a href="#" class="image full"><img src="images/pic07.jpg" alt="" /></a>--> <div style="text-align:center;"> <form enctype="multipart/form-data" action="<?php echo $_SERVER["PHP_SELF"];?>" method="post"> <label class="labelwarning"> Make sure the car is a cheap car.</label> </br></br> <label>Car Name</label> </br> <input type="text" name="car_name" required> </br> <label>Car Color</label> </br> <input type="text" name="car_color" required> </br> </br> <label>Transmission Type</label> </br> <select name="car_transmission" required> <option value="">Select Transmission</option> <option value="M">Manual</option> <option value="A">Auto</option> </select> </br> </br> <div id="image_preview"><img id="previewing" src="images/noimage.png" /></div> <div id="selectImage"> <label>Select Your Image</label><br/> <input type="file" name="fileToUpload" id="file" required /> </div> <div id="message"></div> </br> <label>NO Plate</label> </br> <input type="text" class=text2 name="car_plate" required> </br> <label>Price per Day</label> </br> <input type="text" class=text2 name="car_price" required> </br> </br> </br> <input type="submit" name="submit" value="Submit"> </div> </div> </div> </div> </div> <!-- Footer --> <div id="featured"> <div class="container"> <div class="row"> <h2>Our Company Details</h2> <p>Rent and Go Rental is one of the class's best-known car rental brands. Design owned by a person who created this template, which operates and licenses the brand throughout the Internet. Rent and Go Rental was founded in 2016 as a car rental company for the "budget and melayu minded" renter. So everyone can drive like Malay.</p> <!-- <p><a href="#" class="button">More Details</a></p>--> </div> </div> </div> </div> <?php if(isset($_POST['submit'])){ $carname_temp = $_POST['car_name']; $carcolor_temp = $_POST['car_color']; $cartranmission_temp = $_POST['car_transmission']; $carplate_temp = $_POST['car_plate']; $carprice_temp = $_POST['car_price']; $query = mysql_query("INSERT INTO Car_Type(CarName,PricePerHour) VALUES ('$carname_temp', $carprice_temp)"); if($query){ $query2 = mysql_query("INSERT INTO Car_Info(PlateNo,Transmission_Type,Colour,Check_Availability,CarTypeID) SELECT '$carplate_temp','$cartranmission_temp', '$carcolor_temp', 'Y', CarTypeID FROM Car_Type WHERE CarName = '$carname_temp'"); if($query2){ ?> <script> alert("New car added"); </script> <?php } } $query3 = mysql_query("SELECT * FROM Car_Type ORDER BY CarTypeID DESC LIMIT 1"); $row4 = @mysql_fetch_array($query3); $fileName = $_FILES['fileToUpload']['name']; $tmpName = $_FILES['fileToUpload']['tmp_name']; $filesize = $_FILES['fileToUpload']['size']; $filetype = $_FILES['fileToUpload']['type']; //remove space if file name $fileName=str_replace (' ', '',$fileName); $newfilename = $row4['CarTypeID'].'.jpg'; //file upload coding here move_uploaded_file($_FILES['fileToUpload']['tmp_name'], "images/$newfilename"); } ?> <!-- Copyright --> <div id="copyright"> <div class="container"> Design: © Copyright 2016 R&G Car Enterprise. All Rights Reserved. </div> </div> </body> </html> If u guys need full system including the database.sql file, let me know i'll give it to you thorugh your email. Thank you in advance for helping me