To subtract hours from a DateTime object in PHP, you can use the DateTime class along with the sub() method and a DateInterval representing the duration you want to subtract. Here’s a step-by-step guide on how to achieve this:

Step 1: Create a DateTime object with the initial date and time.

$initial_datetime = new DateTime('2023-05-25 12:30:00'); // Replace this with your initial date and time

Step 2: Define the number of hours you want to subtract from the initial DateTime.

$hours_to_subtract = 3; // Replace this with the number of hours to subtract

Step 3: Use the sub() method to subtract the hours from the DateTime object.

$modified_datetime = $initial_datetime->sub(new DateInterval('PT' . $hours_to_subtract . 'H'));

Step 4: Format the modified DateTime object to display the result in the desired format.

$result_datetime = $modified_datetime->format('Y-m-d H:i:s');

Here’s the complete code in one block:

<?php
$initial_datetime = new DateTime('2023-05-25 12:30:00'); // Replace this with your initial date and time
$hours_to_subtract = 3; // Replace this with the number of hours to subtract
$modified_datetime = $initial_datetime->sub(new DateInterval('PT' . $hours_to_subtract . 'H'));
$result_datetime = $modified_datetime->format('Y-m-d H:i:s');

echo "Result DateTime: " . $result_datetime;
?>

The output will be the DateTime with the specified number of hours subtracted from the initial DateTime.

For example, if you want to subtract 3 hours from the DateTime '2023-05-25 12:30:00', the output will be:

Result DateTime: 2023-05-25 09:30:00

In this example, we use the sub() method with a DateInterval object that represents the duration of hours to be subtracted ('PT' . $hours_to_subtract . 'H' represents the format for a duration of hours). The modified DateTime object is then formatted to display the result in the desired format ('Y-m-d H:i:s').