How can a UNIX timestamp be converted to display the date and time in a specific format in PHP?

To convert a UNIX timestamp to display the date and time in a specific format in PHP, you can use the `date()` function. This function allows you to format a timestamp into a human-readable date and time string. You can specify the desired format using format characters such as 'Y' for the year, 'm' for the month, 'd' for the day, 'H' for the hour, 'i' for the minute, and 's' for the second.

$timestamp = 1614787200; // UNIX timestamp
$date = date('Y-m-d H:i:s', $timestamp); // Format the timestamp into a specific date and time format
echo $date; // Output the formatted date and time