Math function atan2() to return Arc tangent of two inputs in PHP

Find an angle from x and y coordinates

atan2() uses both coordinate components to determine the correct quadrant and returns the angle in radians. Convert the result with rad2deg() when you need degrees.

$y = 1;
$x = 1;
$angle = atan2($y, $x);
echo rad2deg($angle); // 45

Start with this current pattern. The examples below are retained for additional variations, output and reference.

<?Php
echo atan2(0,2); // Output is 0
echo "<br>";
echo atan2(1,3); // Output  0.32175055439664
echo "<br>";
echo atan2(-1,-3); // -2.8198420991932
echo "<br>";
echo atan2(4,2); // Output is 1.1071487177941
echo "<br>";
echo atan2(2,1); // Output is 1.1071487177941
echo "<br>";
echo atan2(90,180); // Output is 0.46364760900081
?>

atan2(float $y,float $x);

X & Y are the input values

Example: Angle for Positive Coordinates

$x = 1;
$y = 1;
echo atan2($y, $x);  // Output: 0.78539816339745 (45 degrees in radians)

Example: Angle for Negative Coordinates

$x = -1;
$y = -1;
echo atan2($y, $x);  // Output: -2.3561944901923 (-135 degrees in radians)

Example: Angle for Horizontal Line

$x = 5;
$y = 0;
echo atan2($y, $x);  // Output: 0 (Horizontal line along the positive x-axis)

The function returns a result between -π and π.
These examples illustrate the use of `atan2()` to determine the angle for various coordinate positions.

Questions

What does the `atan2()` function in PHP do?
What is the purpose of the `atan2()` function in PHP?
How is the `atan2()` function used to calculate the arctangent of the quotient of two numbers?
What is the range of values returned by the `atan2()` function in PHP?
How does the `atan2()` function differ from the `atan()` function in PHP?
What are the parameters required by the `atan2()` function?
Can the `atan2()` function be used with both degrees and radians?
What happens if you pass invalid arguments to the `atan2()` function?
How can you use the `atan2()` function to calculate the angle in radians given the x and y coordinates?
What type of value does the `atan2()` function return: integer, float, or something else?

MIN() function
Math Functions

Subhendu Mohapatra

Author & Instructor at plus2net

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atan2():the arc tangent of the quotient of its two arguments