php wont redirect after form submission - php

Question

I am trying to get my page to redirect after deleting a record from the database but it wont redirect. It is echoing out text and also deleting the record but it just reloads me on the same page with a form that no longer has information in it.
Here is the button im using
echo '<form>';
echo '<br /><br /><input style="cursor:pointer" class="button" type="submit" value="Delete Event" name="delete" id="delete" />';
echo '</form>';
Here is the PHP im using to delete the row from the DB
if (isset($_POST['delete'])){
$mysqli->query('DELETE FROM information WHERE id = '.intval($_GET['id']));
header('Location: index.php');
}
I have no idea whats wrong with it.

Answer 1

The header doesn't work, probably because there's already another one.
I suggest you to use a little part of Javascript:
if (isset($_POST['delete'])){
$mysqli->query('DELETE FROM information WHERE id = '.intval($_GET['id']));
echo "<script type='text/javascript'>window.location.href = 'index.php'</script>";
}

Answer 2

I assume that both the code snippets are present in a single PHP file. Then, your form will by default post to the same file using GET method.
Change your PHP code to look like this:-
<?php
if (isset($_GET['delete'])){
$mysqli->query('DELETE FROM information WHERE id ='.intval($_GET['id']));
header('Location: index.php');
}
echo '<form>';
echo '<br /><br /><input style="cursor:pointer" class="button" type="submit" value="Delete Event" name="delete" id="delete" />';
echo '</form>';
?>

Answer 3

Your form tag is completely empty. You check if $_POST["delete"] is set, but you haven't even specified the method of communication between your form and your PHP file on your form. Try changing your starting form tag to this:
<form method = "POST" action = "YOUR PHP FILE.php">
Your PHP file seems fine as long as index.php is on the same level as the form.
You can also redirect your page to somewhere else this way:
echo "<meta http-equiv="refresh" content="1;url=index.php"/>"

Answer 4

<form>
Delete id <input type = "text" name ="deleteid" id ="deleteid"/>
<input type ="submit" name = "submit" />
</form>
<?php
if (isset($_POST['submit'])){
$id = $_POST['deleteid'];
$query = "DELETE FROM information WHERE id = $id";
//rest Execute the query
header('Location: xyx.php');
}
<?