how to properly compare two values from strtotime - php

Question

I am trying to prevent a user from cancelling a booking if the booking is less than 2 days away. I tried doing this by getting the current date and the date of the booking, converting them both to strtotime and then checking if one value was greater than the other. However when I run my code though all it does is redirect to page which only displays the value of $diff
Here is my code
<?php
$customerRef = $_SESSION['customerRef'];
$messageCancelError;
$messageSuccess;
if (isset($_POST['Cancel']))
{
if ($_SERVER['REQUEST_METHOD'] == 'POST')
{
$cancelAppointment = $_POST['cancel'];
//echo $cancelAppointment;
$sql4 = "SELECT dateOfBooking FROM booking WHERE bookingRef=? AND customerRef=?";
// initalise the prepared statement
$stmt4 = mysqli_stmt_init($conn);
// prepare the prepared statement
if (mysqli_stmt_prepare($stmt4, $sql4))
{
// bind values to the prepared statement
mysqli_stmt_bind_param($stmt4, "ss", $cancelAppointment, $customerRef);
// execute the prepared statement
mysqli_stmt_execute($stmt4);
// store the results of the prepared statement
mysqli_stmt_store_result($stmt4);
// bind the results of the prepared statement to variables
mysqli_stmt_bind_result($stmt4, $appointmentDate);
mysqli_stmt_fetch($stmt4);
//echo mysqli_stmt_error($stmt4);
//gets the current date in y-m-d format
$date = date('Y-m-d'); //gets the difference in todays date and the date of an appointment in seconds
$diff = abs(strtotime($date) - strtotime($appointmentDate)); echo $diff;
}
$stmt4->close();
}
$stmt4->close();
//172800 seconds in 2 days
if ($diff > 172800)
{
// checking for customer ref as well to prevent a user cancelling another users booking
$sql3 = "DELETE FROM booking WHERE bookingRef =? AND customerRef =?";
$stmt3 = mysqli_stmt_init($conn);
if (mysqli_stmt_prepare($stmt3, $sql3))
{
mysqli_stmt_bind_param($stmt3, "si", $cancelAppointment, $customerRef);
mysqli_stmt_execute($stmt3);
mysqli_stmt_store_result($stmt3);
// echo mysqli_stmt_error($stmt3);
}
if (mysqli_stmt_affected_rows($stmt3) === 1)
{
$messageSuccess = "Booking Cancelled";
}
else
{
$messageCancelError = "Couldn't cancel your booking, check your booking ref against existing ones ";
}
}
// Close statement
$stmt3->close();
// Close connection
// $conn->close();
}
I have tried changing it to this but the error is still happening
if ($diff > 172800) {
// checking for customer ref as well to prevent a user cancelling another users booking
$sql3 = "DELETE FROM booking WHERE bookingRef =? AND customerRef =?";
$stmt3 = mysqli_stmt_init($conn);
if (mysqli_stmt_prepare($stmt3, $sql3)) {
mysqli_stmt_bind_param($stmt3, "si", $cancelAppointment, $customerRef);
mysqli_stmt_execute($stmt3);
mysqli_stmt_store_result($stmt3);
// echo mysqli_stmt_error($stmt3);
if (mysqli_stmt_affected_rows($stmt3) === 1) {
$messageSuccess = "Booking Cancelled";
}//affected rows
}//stmt_prepare
}//$diff
else {
$messageCancelError = "Couldn't cancel your booking, check your booking ref against existing ones ";
}

Answer 1

Your if block needs to change.
Change:
//172800 seconds in 2 days
if ($diff > 172800)
{
...
if (mysqli_stmt_affected_rows($stmt3) === 1)
{
$messageSuccess = "Booking Cancelled";
}
else
{
$messageCancelError = "Couldn't cancel your booking, check your booking ref against existing ones ";
}
}
// Close statement
To:
//172800 seconds in 2 days
if ($diff > 172800)
{
...
if (mysqli_stmt_affected_rows($stmt3) === 1)
{
$messageSuccess = "Booking Cancelled";
}
}
else
{
$messageCancelError = "Couldn't cancel your booking, check your booking ref against existing ones ";
}
// Close statement