public ImageInterface::rotate($degrees, $background = NULL)
Rotates an image by the given number of degrees.
float $degrees: The number of (clockwise) degrees to rotate the image.
string|null $background: (optional) An hexadecimal integer specifying the background color to use for the uncovered area of the image after the rotation; for example, 0x000000 for black, 0xff00ff for magenta, and 0xffffff for white. When NULL (the default) is specified, for images that support transparency, this will default to transparent; otherwise, it will default to white.
bool TRUE on success, FALSE on failure.
public function rotate($degrees, $background = NULL);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Image!ImageInterface.php/function/ImageInterface::rotate/8.1.x