Find the value of PI

                
                    <?php
                    echo(pi());
                    ?>
                
                

Find the lowest and highest value in a list of arguments

                
                    <?php
                    echo(min(0, 150, 30, 20, -8, -200) . "<br>");
                    echo(max(0, 150, 30, 20, -8, -200));
                    ?>
                
                

Find the absolute (positive) value of a number

                
                    <?php
                    echo(abs(-6.7));
                    ?>
                
                

Find the square root of a number

                
                    <?php
                    echo(sqrt(64) . "<br>");
                    echo(sqrt(0) . "<br>");
                    echo(sqrt(1) . "<br>");
                    echo(sqrt(9));
                    ?>
                
                

Round a floating-point number to its nearest integer

                
                    <?php
                    echo(round(0.60) . "<br>");
                    echo(round(0.50) . "<br>");
                    echo(round(0.49) . "<br>");
                    echo(round(-4.40) . "<br>");
                    echo(round(-4.60));
                    ?>
                
                

Generate a random number

                
                    <?php
                    echo(rand());
                    ?>
                
                

Generate a random number between 10 and 100

                
                    <?php
                    echo(rand(10, 100));
                    ?>