mysqli insert, what is wrong? - php

Question

the data is not inserting. i think there is something wrong in
$sql = "INSERT INTO `users` (`Username`, `Password`, `FirstName`, `LastName`, `Email`, `ContactNumber`)
VALUES ('".$_POST["Username"]."','".$_POST["Password"]."','".$_POST["FirstName"]."','".$_POST["LastName"]."','".$_POST["Email"]."','".$_POST["ContactNumber"]."')";
When i try to change the statement in "else" with echo "successs"; its working.
please someone can tell me what is wrong.
<?php
error_reporting(E_ALL & ~E_NOTICE);
if(isset($_POST["Register"]))
{
$servername = "localhost";
$username = "root";
$password = "";
$dbname = "dbuseraccounts";
// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
$user = $_POST['Username'];
$pass = $_POST['Password'];
$query = mysqli_query($conn, "SELECT * FROM users WHERE Username= '".$user."'");
if(mysqli_num_rows($query) > 0)
{
echo "email already exists";
}
else
{
$sql = "INSERT INTO users (Username, Password, FirstName, LastName, Email, ContactNumber)
VALUES ('".$_POST["Username"]."','".$_POST["Password"]."','".$_POST["FirstName"]."','".$_POST["LastName"]."','".$_POST["Email"]."','".$_POST["ContactNumber"]."')";
}
$conn->close();
}
?>

Answer 1

Your data is not inserting because you haven't even executed your query.
if (mysqli_num_rows($query) > 0) {
echo "Username already exists";
} else {
$sql = "INSERT INTO users (Username, Password, FirstName, LastName, Email, ContactNumber) VALUES ('".$_POST["Username"]."','".$_POST["Password"]."','".$_POST["FirstName"]."','".$_POST["LastName"]."','".$_POST["Email"]."','".$_POST["ContactNumber"]."')";
/* Run your query and check for errors */
$query = mysqli_query($conn, $sql) or die(mysqli_error($conn));
}

Answer 2

Please Execute query using
mysqli_query($conn, your query);