atan():

atan(X);
X is the angular value in radian. We get output as ARC tangent of the input angle.
<?Php
echo atan(0); // Output is 0
echo "<br>";
echo atan(1); // Output  0.78539816339745
echo "<br>";
echo atan(-1); // -0.78539816339745
echo "<br>";
echo atan(4); // Output is 1.325817663668
echo "<br>";
echo atan(2); // Output is 1.1071487177941
echo "<br>";
echo atan(90); // Output is 1.5596856728973
?>

deg2rad() with atan()

We can use deg2rad() to convert Degree value to radian and then use atan().
<?Php
echo atan(deg2rad(45)); // Output 0.66577375002835
echo "<br>";
echo atan(deg2rad(90)); // Output 1.0038848218539
echo "<br>";
echo atan(deg2rad(180)); // Output 1.2626272556789
echo "<br>";
echo atan(deg2rad(1)); // Output 0.017451520651466
echo "<br>";
echo atan(deg2rad(-1)); // Output -0.017451520651466
echo "<br>";
echo atan(deg2rad(-4)); // Output -0.069700080299613
echo "<br>";
echo atan(deg2rad(-90)); // Output -1.0038848218539
echo "<br>";
echo atan(deg2rad(-180)); // Output -1.2626272556789
?>


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