What is the difference between using round() and ceil() in PHP for rounding numbers?

The main difference between using round() and ceil() in PHP for rounding numbers is that round() rounds a number to the nearest integer, while ceil() always rounds a number up to the nearest integer. If you want to round a number to the nearest integer, use round(). If you want to always round a number up to the nearest integer, use ceil().

// Using round() to round a number to the nearest integer
$number = 4.6;
$roundedNumber = round($number);
echo $roundedNumber; // Output: 5

// Using ceil() to always round a number up to the nearest integer
$number = 4.2;
$roundedNumber = ceil($number);
echo $roundedNumber; // Output: 5