PHP acos() function
 Complete PHP Math Reference
Definition and Usage
The acos() function returns the arccosine of a number as a numeric value value
between 0 and PI 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.
Example
In this example we will get the arccosine of different numbers:
<?php
echo(acos(0.64) . "<br />");
echo(acos(0) . "<br />");
echo(acos(-1) . "<br />");
echo(acos(1) . "<br />");
echo(acos(2))
?>
|
The output of the code above will be:
0.876298061168
1.57079632679
3.14159265359
0
-1.#IND
|
Complete PHP Math Reference
| 
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