(PHP 4, PHP 5)
deg2rad — Converts the number in degrees to the radian equivalent
This function converts number from degrees to the radian equivalent.
Angular value in degrees
The radian equivalent of number
Example #1 deg2rad() example
<?phpecho deg2rad(45); // 0.785398163397var_dump(deg2rad(45) === M_PI_4); // bool(true)?>