PHP asin()

The asin() function returns the arc sine of a number between -1 and 1.

Syntax

asin(number)

The asin() function takes only one parameter, number, a number between -1 and 1 of type float. The function returns the arc sine of the number in radians as a float value.

If the number is outside of the range of -1 to 1, the function returns NAN (not a number).

Codebyte Examples

The codebyte example below uses the asin() function to return the arc sine of 2 and -1:

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