Rotates an image - Справочник: PHP5.4

bool Imagick::rotateImage ( mixed $background , float $degrees )

Rotates an image the specified number of degrees. Empty triangles left over from rotating the image are filled with the background color.

В случае успешной работы возвращает TRUE.

Версия	Описание
2.1.0	Now allows a string representing the color as the first parameter. Previous versions allow only an ImagickPixel object.