How do I develop a PHP extension? What should PHP extensions pay attention to?

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There are many extended development tutorials on the Internet, such as: http://www. LARUENCE.COM/2009/04/28 /719.html in the source of the Ext directory, also comes with a lot of classic examples.
It is important to note that
1. Use PHP's extended build system to create/publish extensions, do not write makefile yourself, or build.sh
2. Use the Zend API or PHP API as much as you can to ensure platform independence to a large extent.
3. Try to use only c89.
4. Practice more ... Recommended Extending and Embedding PHP this book. PHP extension is written by the C language, most of the library is provided by Zend, it is recommended to look at the Github/code.google many open source extension of the source bar

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