深入理解PHP内核

https://docs.kilvn.com/tipi/
https://github.com/watergang/tipi/

PHP扩展开发及内核应用

https://github.com/walu/phpbook/blob/master/index.md

PHP扩展开发入门

https://github.com/andot/bped

PHP7扩展开发

https://github.com/owenliang/php7-extension-explore

Zend官方资料

https://php-legacy-docs.zend.com/manual/php5/en/index
https://www.zend.com/resources/writing-php-extensions

PHP内核英文资料

https://www.phpinternalsbook.com/
https://phpinternals.net/

鸟哥php系列文章参考
https://www.laruence.com/2009/04/28/719.html