PHP asin() Function
 Complete PHP Math Reference
Definition and Usage
The asin() function returns the arcsine of a number as a numeric value between
-PI/2 and PI/2 radians.
Syntax
| Parameter |
Description |
| x |
Required. Must be a numeric value in the range -1 to 1 |
Tips and Notes
Note: If the parameter x is
outside the range -1 to 1, the browser will return -1.#IND.
Note: 1 will return the value
of PI/2.
Example
In this example we will get the arcsine of different numbers:
<?php
echo(asin(0.64) . "<br />");
echo(asin(0) . "<br />");
echo(asin(-1) . "<br />");
echo(asin(1) . "<br />");
echo(asin(2))
?>
|
The output of the code above will be:
0.694498265627
0
-1.57079632679
1.57079632679
-1.#IND
|
Complete PHP Math Reference
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