atan

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atan - Arc tangent
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atan( float$num ): float

Returns the arc tangent of num in radians. atan is the inverse function of tan, which means that a==tan(atan(a)) for every value of a that is within atan's range.

Parameters

num

The argument to process

Return Values

The arc tangent of num in radians.

Related Functions

  • acos - Arc cosine
  • asin - Arc sine
  • atanh - Inverse hyperbolic tangent
  • tan - Tangent

Example of atan

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<?php
echo atan(0.64) . "\n";
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Function atan:

Mathematical Functions Functions

Most used PHP functions