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PHP's Source Code for PHP Developers - Part 2 - Function Definitions

Note: This article was originally published at Planet PHP on 17 March 2012.
Planet PHP
Part 2 of the PHP's Source Code for PHP Developers series is up over on Nikic's Blog. AIn it, he discusses how internal PHP functions are defined, and how to figure out what they do. APart 3 will be back over here and will cover how variables work internally (The ZVAL). AEnjoy!