Php form enters nothing in database but echoes successfully

Question

I created a simple student registration form with php and it works fine in localhost, it pushes data in database with no problem, until i uploaded it to hosting where it started not to work.

here is the action.php

<?php
session_start();
include('db.php');
$nickname=$_POST['nickname'];

$result  = "SELECT  *  FROM  members  WHERE  nickname='".$nickname."'";
$member_result = mysqli_query($db, $result);
$count = mysqli_num_rows($member_result);

if  ($count < 0 )  {
header("location:  register.php?remarks=failed");
} else {

$month = $_POST['month'];
$day = $_POST['day'];
$year = $_POST['year'];
$date = date("Y-m-d");
$fullname= $_POST['fullname'];
$former_school=$_POST['former_school'];
$address=$_POST['address'];
$nickname=$_POST['nickname'];
$guardian=$_POST['guardian'];
$referrer = $_POST['referrer'];
$query = "INSERT  INTO  members(date, fullname, former_school, address, nickname, guardian, referrer, month, day, year)VALUES ('".$date."', '".$fullname."', '".$former_school."','".$address."', '".$nickname."',  '".$guardian."', '".$referrer."', '".$month."', '".$day."', '".$year."')";
$query_result = mysqli_query($db, $query);
header("location:  register.php?remarks=success");
}
?>

and my database sql

CREATE TABLE `members` (
`mem_id` int(20) NOT NULL PRIMARY,
`month` varchar(25) COLLATE utf8_unicode_ci NOT NULL,
`year` int(25) NOT NULL,
`date` date NOT NULL,
`fullname` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
`former_school` varchar(50) COLLATE utf8_unicode_ci NOT NULL,
`address` varchar(50) COLLATE utf8_unicode_ci NOT NULL,
`nickname` varchar(50) COLLATE utf8_unicode_ci NOT NULL,
`guardian` varchar(50) COLLATE utf8_unicode_ci NOT NULL,
`referrer` varchar(50) COLLATE utf8_unicode_ci NOT NULL,
PRIMARY KEY (`mem_id`)
);

any comment and help is highly appreciated. Thank you.

Answer 1

In your table the day is missing but you are inserting a day in your INSERT statement. This leads to a MYSQL Error.

Very very important note : Never do something like INSERT INTO table ... '".$_POST['anything']."'"; . Use prepared statements instead.

Using '; \\n DROP TABLE members; -- '; \\n DROP TABLE members; -- '; \\n DROP TABLE members; -- as the nickname in your form this will delete your whole database!

Also you can use mysqli_error() instead of header() for debugging. This will print you a nice error message where it sais something like "Column day is not defined.".