refer to:
https://xz.aliyun.com/t/5152
有好几个是全绿的:
https://uuzdaisuki.com/2021/05/11/webshell%E5%85%8D%E6%9D%80%E7%A0%94%E7%A9%B6php%E7%AF%87/
用py脚本批量生成：
Security Php Webshell免杀
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