← All built-ins / acos()
acos()
acos(mixed $number): float
Parameters
| Name | Type | Description |
|---|---|---|
| $number | float|int | value in [-1, 1] |
Return value
Arccosine in radians.
Example
echo round(acos(-1), 4), " ", round(acos(1), 3);
3.1416 0
| Name | Type | Description |
|---|---|---|
| $number | float|int | value in [-1, 1] |
Arccosine in radians.
echo round(acos(-1), 4), " ", round(acos(1), 3);
3.1416 0