Using the ceil() Function in PHP to Round Numbers Upward

In PHP, the ceil() function is used to round a floating‑point number up to the smallest integer that is greater than or equal to the original value.

Syntax of the ceil() function

<code>float ceil(float $number)</code>

The parameter $number represents the value to be rounded up. The function returns the smallest integer that is greater than or equal to $number .

Using the ceil() function

Example 1:

<code>$number = 3.14;
$ceilNumber = ceil($number);
echo "Rounded up result: " . $ceilNumber;</code>

The code above outputs:

<code>Rounded up result: 4</code>

Here, a floating‑point number $number of 3.14 is rounded up, resulting in 4, which is the smallest integer not less than 3.14.

Example 2:

<code>$number = -5.7;
$ceilNumber = ceil($number);
echo "Rounded up result: " . $ceilNumber;</code>

The code above outputs:

<code>Rounded up result: -5</code>

In this case, the negative floating‑point number $number of -5.7 is rounded up to -5, the smallest integer that is greater than or equal to -5.7.

Example 3:

<code>$number = 10;
$ceilNumber = ceil($number);
echo "Rounded up result: " . $ceilNumber;</code>

The code above outputs:

<code>Rounded up result: 10</code>

When $number is already an integer (10), ceil() returns the original value unchanged because it is already the smallest integer not less than itself.

In summary, the ceil() function in PHP is a practical tool for rounding up both floating‑point numbers and integers, and the provided examples clearly demonstrate its usage and effects in various scenarios.