(TimThumb is a very simple and convenient PHP program for cropping pictures, as long as you set some parameters to it, it can generate thumbnails. Many WordPress themes now use TimThumb, a PHP library for thumbnail handling.
Instructions for use:
TimThumb has requirements on the server, and the server needs to support the GD library. General hosts now support it. Then download the script from the TimThumb official website and upload it to the server. In the same directory as TimThumb, create a new cache folder and set the cache file folder as writable.
TimThumb is a very easy to use PHP cropping script. Here's a simple example of cropping an image:
http://your website/timthumb.php?src=absolute URL of image &w=width after cropping&h=height after cropping&q=quality of generated image& ;ct=If it is a PNG image, whether it is transparent after cropping
As can be seen from the above request example, its parameters are all submitted in GET mode.)
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