It seed the random number generator

Example

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

Output

675098144

It returns  Square root

Example

<?php
echo sqrt(16);
?>

Output

4

it returns  hyperbolic sine

Example

<?php
echo sinh(17.7);
?>

Output

24321050.753167

it returns sine value

Example

<?php
echo sin(17.7);
?>

Output

-0.91258244979118

It rounds a float

Example

<?php
echo round(17.7);
?>

Output

18

It generates a random integer

Example

<?php
echo rand();
?>

Output

648369316

It converts the radian number to the equivalent number in degrees

Example

<?php
echo rad2deg(M_PI_4);
?>

Output

45

It returns Exponential expression

Example

<?php
echo pow(-1, 17);
?>

Output

-1

It returns the value of pi

<?php
echo pi();
?>

Output

3.1415926535898

It converts octal number to decimal

Example

<?php
echo octdec(11);
?>

Output

9