Share a php function class for image processing.
There are two ways to generate thumbnails: one is to directly compress the image proportionally, and the other is to crop and then compress the image. The difference between equal-case compression and cropping compression is:
Example compression: It can ensure that the width and length ratio of the picture is reasonable and the picture is complete. However, actual size is not guaranteed to meet requirements.
Cropping and compression: It can ensure that the width and length ratio of the picture is reasonable, and the actual size can also be guaranteed. However, the integrity of the picture cannot be guaranteed.
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