I have created 3 pages showing how to use all the operators with php ( still on going ). These pages are quite large as every operator will have an example image.
Compose page
Page 1 covers -adaptive-blur to -floodfill
Page 2 covers -flop to -sampling-factor
Page 3 covers -scale to -window-group
Notes:
Anthony from the "Examples of ImageMagick Usage" website was a great help in preparing these pages.