stop inserting data in the database when refreshing the page

Question

I am looking for a way to stop inserting or sending data in the database when refreshing the page.

here is my code:

user_details_page.php

<         


        

Answer 1

I was facing the same problem. Was trying to add some data and everytime when I refreshed the page it gets added again. It happens because the page is not loading. For that you need to add:

<?php ob_start();?> in your header file, then include the header in the current file you are working on. After that use the below code

    if (isset($_POST['submit'])) 
{
  $user= $_POST['username'];
  $email = $_POST['useremail'];
  $pass= $_POST['password']; 

  mysql_query("INSERT INTO table (username, useremail, email) VALUES(`$username','$useremail','$email')");

//user it before if statement
header("location: onthesamepage/oranyotherpage.php");
}

Answer 2

What is going on here is that when you refresh page, the form is submitted twice.

To prevent this, you can use sessions:

session_start();

if( $_SESSION['submit'] == $_POST['submit'] && 
     isset($_SESSION['submit'])){
    // user double submitted 
}
else {
    // user submitted once
    $_SESSION['submit'] = $_POST['submit'];        
} 

Answer 3

Header the user to a new page :

if (isset($_POST['submit'])) 
{
  $user= $_POST['username'];
  $email = $_POST['useremail'];
  $pass= $_POST['password']; 

  mysql_query("INSERT INTO table (username, useremail, email) VALUES(`$username','$useremail','$email')");

}
//best outside the if statement so user isn't stuck on a white blank page.
header("location: landing_page.php");
exit;

By doing this the user who refreshes will be refreshing landing_page.php which means it won't do the insert twice.

best advice: do a check to see if user exists first if so don't insert!

Answer 4

confirm_page.php:

if (isset($_POST['submit'])) 
{
$user= $_POST['username'];
$email = $_POST['useremail'];
$pass= $_POST['password']; 

mysql_query("INSERT INTO table (username, useremail, email) VALUES ('$username','$useremail','$email')"); // <-- missing endquote and bracket here

header('Location: somewhere_else.php');
exit;
}

Answer 5

if($_POST(submit)
{
 //database insertion query
 // if successful insertion
    {
echo"<script language='javascript'>alert('successfully inserted')</script>";
echo"<script>document.location='your_page.php';</script>;
    }
}

Answer 6

i have this solution by using session

<?php session_start();
        if(isset($_POST[$_SESSION[a][count($_SESSION[a])-1]])){
            echo "somthing....";
            unset($_SESSION[a]);
        }
        else{     
                        echo '<form method="post">';
                              $_SESSION["a"]=array();
                              $_SESSION["a"][0]="a".rand(1,100);
                        echo '<input name="'.$_SESSION["a"][0].'"><br>';
                              $_SESSION["a"][1]="a".rand(1,100);
                        echo '<input name="'.$_SESSION["a"][1].'"><br>';
                              $_SESSION["a"][2]="a".rand(1,100);
                        echo '<input name="'.$_SESSION["a"][2].'"><br>';
                              $_SESSION["a"][3]="a".rand(1,100);
                        echo '<input type="submit" name="'.$_SESSION["a"][3].'" value="submit"><br>';
                        echo '</form>';
        }               
?>