(PHP 4, PHP 5, PHP 7)
deg2rad — Converts the number in degrees to the radian equivalent
deg2rad ( float $number ) : float
This function converts number
from degrees to the radian equivalent.
number
Angular value in degrees
The radian equivalent of number
Example #1 deg2rad() example
<?php echo deg2rad(45); // 0.785398163397 var_dump(deg2rad(45) === M_PI_4); // bool(true) ?>
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https://www.php.net/manual/en/function.deg2rad.php