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Is the Value Returned by the atan2 Function in Standard Radians? How to Convert to Degrees in PHP?

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In PHP, this function returns the angle between a point (x, y) and the x-axis. The function is defined as follows:

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float atan2 ( float $y , float $x )

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It is important to note that atan2() returns the value in radians, not degrees. Radians measure angles based on the radius of a circle, with a full circle equal to 2π radians.

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For example:

$y = 1;
$x = 1;
$angle_radian = atan2($y, $x);
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$angle_radian = atan2(<span>$y</span></span></span><span>, </span><span><span>$x</span></span><span>); // Returns </span><span><span>$angle_radian</span></span><span> radians

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If you want to convert radians to degrees, you can use the formula:

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degrees = radians × (180 / π)

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In PHP, you can directly use the built-in function rad2deg():

$angle_degree = rad2deg($angle_radian);
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$angle_degree = rad2deg($angle_radian); // Result is <span>$angle_degree</span></span></span><span> degrees

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Summary:

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• atan2() returns the value in standard radians.
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• The rad2deg() function can be used to easily convert radians to degrees.
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