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How to turn the user avatar obtained by php WeChat into a circle?

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Release： 2016-09-24 09:03:15
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If you want to paste the obtained user avatar information on the poster as a watermark, instead of displaying it directly, you need to save the avatar first and then crop it into a circle and add it to the poster to generate a new picture
The obtained avatar is a square , how to turn it into a circle?

Related labels：
php WeChat development
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