Can't enter data in to the database using mysql - php

Question

This is the php file that going to enter data into the mysql database. When I run it, browser shows "connected successfully selected successfully Executing inside fileNot Inserted". but it's not going to show any errors. And data is not insert in to the database. What's wrong with this code.
*dbConnection.php
<?php
$dbhost="localhost";
$dbuser="root";
$dbPassword="123";
$database="medicalcenter";
$connection = mysqli_connect($dbhost,$dbuser,$dbPassword) or die("unable to connect");
if($connection){
echo 'connected successfully ';
}else{
echo 'not connected';
}
$dbSelect=mysqli_select_db($connection,$database);
if($dbSelect){
echo 'selected successfully';
}else{
echo 'not selected';
}
?>
*insert.php
<?php
include 'dbConnection.php';
echo "Executing inside file";
$firstName = filter_input(INPUT_POST,'firstname');
$secondName = filter_input(INPUT_POST,'lastname');
$address1 =filter_input(INPUT_POST,'address1');
$address2 =filter_input(INPUT_POST,'address2');
$city =filter_input(INPUT_POST,'city');
$email =filter_input(INPUT_POST,'email');
$age =filter_input(INPUT_POST,'age');
$gender =filter_input(INPUT_POST,'gender');
$sql= "INSERT INTO patient(FirstName,LastName,AddressLine1,AddressLine2,City,Email,Age,Gender) VALUES ('$firstName','$secondName','$address1','$address2','$city',$email','$age','$gender')";
if(mysqli_query($connection,$sql)){
echo 'Inserted successfully';
}else{
echo 'Not Inserted';
}
mysqli_close($connection);
?>

Answer 1

$sql= "INSERT INTO patient(FirstName,LastName,AddressLine1,AddressLine2,City,Email,Age,Gender) VALUES ('$firstName','$secondName','$address1','$address2','$city',$email','$age','$gender')";
check your above line you have forgot ' before email please check with below line. may it helps you.
$sql= "INSERT INTO patient(FirstName,LastName,AddressLine1,AddressLine2,City,Email,Age,Gender) VALUES ('$firstName','$secondName','$address1','$address2','$city','$email','$age','$gender')";