atan
(PHP 4, PHP 5, PHP 7, PHP 8)
atan — Arc tangent
Description
atan(float $num): float
Returns the arc tangent of num in radians. atan() is the inverse function of tan(), which means that a==tan(atan(a)) for every value of a that is within atan()'s range.
Parameters
-
num -
The argument to process
Return Values
The arc tangent of num in radians.
© 1997–2021 The PHP Documentation Group
Licensed under the Creative Commons Attribution License v3.0 or later.
https://www.php.net/manual/en/function.atan.php
