===== Syntax =====

<code php>
float atan(float $angle)
</code>

//(PHP 4, PHP 5)//

^ $angle | The angle parameter which is measured in radians (should be a value between -PI/2 and PI/2. |
^ RETURNS | The arc tangent for the angle parameter specified. |

===== What it Does =====

This function computes the arc tangent for the argument **$angle**.  The result of this trigonometry function can be any real number.

===== Example =====

<code php>
// compute the arc tangent for the angle 1.4 radians
echo 'atan(1.4) = ' . atan(1.4);
</code>