PHP tokens and opcodes : 3 useful extensions for understanding the working of Zend Engine
"PHP tokens and opcodes" - When a PHP script is executed it goes through a number of processes, before the final result is displayed. These processes are namely: Lexing, Parsing, Compiling and Executing. In this blog post, I will walk you through all these processes with a sample example. In the end I will list some useful PHP extensions, which can be used to analyze results of every intermediate process. Lets take a sample PHP script as an example: <?php function increment($a) { return $a+1; } $a = 3; $b = increment($a); echo $b; ?> Try running this script through...