PHP deg2rad() Function

Convert degrees to radians:

<?php
echo deg2rad("45") . "<br>";
echo deg2rad("90") . "<br>";
echo deg2rad("360");
?>

Definition and Usage

The deg2rad() function converts a degree value to a radian value.

Tip: To convert a radian value to a degree value, look at the rad2deg() function.

deg2rad( number);

Parameter	Description
number	Required. Specifies the degree to convert

Return Value:	The radian equivalent of number
Return Type:	Float
PHP Version:	4+

Convert a degree into its radian equivalent:

<?php
$deg = 180;
$rad = deg2rad($deg);
echo "$deg degrees is equal to $rad radians.";
?>