atan

Description
Syntax
Examples
Links

Description

The atan of Math for PHP arc tangent.

Syntax

atan(float $num): float

Parameters

num

The argument to process

Return

The arc tangent of num in radians.

Examples

1

<?

$num = tan(deg2rad(360));

$return = atan($num);

echo $return;

?>

-2.4492935982947E-16

2

<?

for($i = 0; $i <= 360; ++$i)
{
    $num = tan(deg2rad($i));
    
    $return = atan($num);

    echo $return . PHP_EOL;
}

?>

0
0.017453292519943
0.034906585039887
0.05235987755983
0.069813170079773
0.087266462599716
0.10471975511966
0.1221730476396
0.13962634015955
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1.0122909661567
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-0.017453292519943
-1.2246467991474E-16
0.017453292519943
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0.05235987755983
0.069813170079773
0.087266462599716
0.10471975511966
0.1221730476396
0.13962634015955
0.15707963267949
0.17453292519943
0.19198621771938
0.20943951023932
0.22689280275926
0.24434609527921
0.26179938779915
0.27925268031909
0.29670597283904
0.31415926535898
0.33161255787892
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0.36651914291881
0.38397243543875
0.4014257279587
0.41887902047864
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1.0297442586767
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1.2042771838761
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1.535889741755
1.553343034275
1.5707963267949
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-0.017453292519943
-2.4492935982947E-16