PHP WordPress issue with isset() Function

Question

All this code is written on the same page

 <form method="post" action = "http://mypage.lhosting.info/login/" >
    <p> Username: <input type="text" name = "username" /> </p><br>
    <p> Password: <input type="text" name = "password" /></p> <br>
    <input type="submit" name="submit" value="Register" />
 </form>

 if(isset($_POST['submit']) && !empty($_POST['submit'])) 
 {
   $username = mysqli_real_escape_string($conn, $_POST['username']);
   $password = mysqli_real_escape_string($conn, $_POST['password']);
   $sql = "INSERT INTO Duomenys (Username, Password) VALUES ('$username','$password')"; 
 }

The if(isset($_POST['submit']) && !empty($_POST['submit'])) does not trigger, it sends the account's details to my database everytime I refresh the page. What am I doing wrong?

Note: Still learning PHP and WordPress

You can check actually $_POST['submit'] != '' instead of !empty — Ahmed Ginani
– Ahmed Ginani, Commented May 25, 2017 at 5:27
When you refresh the page? Do you submit the form and then refresh the page? Does your browser ask you something along the lines of "Are you sure you want to refresh the page and submit the data again?"…? — deceze
– deceze ♦, Commented May 25, 2017 at 6:25

Ravi Hirani · Accepted Answer · 2017-05-25 06:39:42Z

4

$_POST['submit'] will always set and not empty it's value is already set as Register.

You need to check that username and password should not empty. Hence write

if(!empty($_POST['username']) && !empty($_POST['password'])){
    // querycode here
}

edited May 25, 2017 at 6:39

answered May 25, 2017 at 6:09

Ravi Hirani

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