PHP tan() Function – Returns the Tangent of an Angle in Radians
This article explains PHP’s tan() function, which returns the tangent of a given radian value, details its single float argument, describes the return value, and provides a simple example demonstrating its usage with the constant M_PI_4.
The tan() function in PHP calculates the tangent of an angle provided in radians.
Signature: float tan(float $arg) Parameter: $arg – the angle to be processed, expressed in radians.
Return value: The tangent of $arg as a floating‑point number.
Example:
<?php
echo tan(M_PI_4);
// 1
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