(PHP 4, PHP 5, PHP 7, PHP 8)
asin — Arc sine
Returns the arc sine of
num
in radians.
asin()
is the inverse function of
sin()
, which means that
$num == sin(asin($num))
for every value of
num
that is in
the domain of
asin()
.
num
The argument to processs
The arc sine of
num
in radians