PHP Function: atan

In PHP, the atan function is used to calculate the arctangent of a number. It returns the angle in radians between -π/2 and π/2 whose tangent is the specified number.

Syntax

The syntax for the atan function is:

float atan(float $number)

Here, $number is the number for which you want to calculate the arctangent.

Return Value

The atan function returns the arctangent of the specified number in radians. If the number is not a valid numeric value, it returns NaN (Not a Number).

Examples

Let’s look at some examples to understand how the atan function works:

$x = 1;
$y = atan($x);
echo $y; // Output: 0.78539816339745

$x = 0;
$y = atan($x);
echo $y; // Output: 0

$x = -1;
$y = atan($x);
echo $y; // Output: -0.78539816339745

In the first example, the arctangent of 1 is calculated, which is approximately 0.78539816339745 radians. In the second example, the arctangent of 0 is calculated, which is 0 radians. In the third example, the arctangent of -1 is calculated, which is approximately -0.78539816339745 radians.

Summary

The atan function in PHP is used to calculate the arctangent of a number. It returns the angle in radians between -π/2 and π/2 whose tangent is the specified number. It is a useful function for various mathematical calculations and can be used in a wide range of applications.

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