mysqli deletion - php

Question

<?php
if (intval($_GET['page']) == 0) {
redirect_to("staff.php");
}
$id = mysqli_prep($_GET['page']);
$query3 = "DELETE FROM page WHERE id = {$id}, LIMIT 1";
$result = mysqli_query($connection, $query3);
if (mysqli_affected_rows($connection) == 1) {
redirect_to("staff.php");
} else {
// Deletion Failed
echo $id ."<br />" . $query3 . "<br />" . $result . "<p>Subject
deletion failed.</p>";
echo "<p>" . mysqli_error() . "</p>";
echo "Return to Main Page";
}
// Keep on working Edit:2#
mysqli_query($connection, "DELETE FROM pages WHERE id = 11 ");
//- Works
Edit 3#
$id = $_GET['page'];
echo "<p>" . $id ."</p>";
$query3 ="DELETE FROM pages WHERE id = {$id} ";
mysqli_query($connection,$query3 );
// Still Works -- YaY for working backwards
// Edit #4 By "now it might be obvious what my error was "pages" not "page"
// Thanks everyone - And thank you for telling me about the error page
// My defense - newbie- Anyway Lesson from this - working backwards
// Takes a while, Error checking Fast!!!!!!
?>
$connection is started and selected. The $id is selected successfully, and the $page = $id, but it still will not work. $query 3 seems fine, but Deletion failed. I don't have any idea what the error is. Thanks for any help in advance.
-Josh Edit Check Error Check

Answer 1

You have a comma after the ID:
$query3 = "DELETE FROM page WHERE id = {$id}, LIMIT 1";
^ remove this

Answer 2

I don't have any idea what the error is.
That's because you didn't check. Every time you prepare or execute a query, you need to check for errors. Most of the functions in mysqli return FALSE if they encounter an error.
$result = mysqli_query($connection, $query3);
if ($result === false) {
trigger_error(mysqli_error($connection), E_USER_ERROR);
header("Location: /error.php");
exit;
}
The failure to check for error cases is one of the most common blunders committed by database programmers.

Answer 3

if ($page == get_page_by_id($id)) {
== for comparison
=== to compare the value and the cast
$val = true;
if ($val === true) {
echo "\$val is bool(true)";
}
if ($val == "true") {
echo "\$val matches value";
}
if ($val === "true") {
// this will never happen
} else {
echo "\$val doesnt === \"true\"";
}

Answer 4

try to use php_flag display_errors on in your .htaccess
this will allow you to see and identify php errors.