Duplicate insert into MySQL - php

Question

Im using the following code and testing it using WAMP on my localhost.
It works fine and inserts the data however for some reason it creates duplicate row.
Is there are reason why it makes it appear twice?
<?php
require "conn.php";
$name =$_POST["name"];
$surname = $_POST["surname"];
$age = $_POST["age"];
$username = $_POST["username"];
$userpass = $_POST["password"];
$mysql_qry = "insert into employee_data(name, surname, age, username, password) values ('$name', '$surname', '$age', '$username', '$userpass')";
$result = mysqli_query($conn, $mysql_qry);
if ($conn->query($mysql_qry) === TRUE){
echo "insert success";
}
else{
echo "Error:" .$mysql_qry . "<br> " . $conn->error;
}
$conn->close();
?>
Thank you

Answer 1

YES, you run the query TWICE, see comments in the code
<?php
require "conn.php";
$name =$_POST["name"];
$surname = $_POST["surname"];
$age = $_POST["age"];
$username = $_POST["username"];
$userpass = $_POST["password"];
$mysql_qry = "insert into employee_data
(name, surname, age, username, password)
values ('$name', '$surname', '$age', '$username', '$userpass')";
//ONCE HERE
$result = mysqli_query($conn, $mysql_qry);
//AND AGAIN HERE
if ($conn->query($mysql_qry) === TRUE){
echo "insert success";
}
else{
echo "Error:" .$mysql_qry . "<br> " . $conn->error;
}
$conn->close();
?>
ALSO Your script is wide open to SQL Injection Attack
Even if you are escaping inputs, its not safe!
Use prepared parameterized statements in either the MYSQLI_ or PDO API's
Coded using prepared and bound queries
<?php
require "conn.php";
$sql = "insert into employee_data
(name, surname, age, username, password)
values (?,?,?,?,?)";
$stmt = $conn-prepare($sql);
$stmt->bind_param('sssss', $_POST["name"],
$_POST["surname"];
$_POST["username"];
$_POST["password"];
if ( $stmt->execute() ){
echo "insert success";
}else{
echo "Error:" .$mysql_qry . "<br> " . $conn->error;
}
$conn->close();
?>
Now I have to mention how bad it is to use Plain Text Password.
PHP provides password_hash()
and password_verify() please use them.
And here are some good ideas about passwords