What is asin() in PHP?
The asin()
Figure 1 shows the mathematical representation of the asin() function.
To convert radians to degrees, use:
degrees = radians * ( 180.0 / M_PI )
Syntax
float asin(num)
Parameter
The asin() function requires a number as a parameter.
Return value
asin() returns the inverse sine of the number that is sent as a parameter. The return value lies in the interval [-pi/2, pi/2] in radians.
Example
<?php#Positive number in radiansecho("asin(0.5): ");echo (asin(0.5));echo(" Radians")?><?php#Negative number in radiansecho("asin(-0.5): ");echo (asin(-0.5));echo(" Radians")?><?php#applying asin() and then converting the result in radians to degrees#radians = 0.5echo("asin(0.5) * (180.0 / M_PI)): ");echo (asin(0.5) * (180.0 / M_PI));echo(" Degrees")?>
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