10. Looks confusing, but this is...
● how PHP works
● cool for debugging purposes
● visualizing code complexity
● helpful trying to understand opcaches like
APC
11. Try it with your code
http://explain.php.net.so
13. No! XHProf is about profiling
● XHProf is a function-level hierarchical
profiler for PHP
● Reports timing information for every function
called
● C-Extension can be loaded via PECL
● GUI and libs available
18. OpCode Cache
● Performance enhancing extension for PHP
● Hooking into the execution life-cycle
● Caching the results of the compilation phase
for later reuse
● APC
● XCache
19. HHVM
● HipHop Virtual Machine
● Designed for executing PHP programs
● Predecessor HPHPc makes C out of PHP
● Uses a just-in-time (JIT) compilation
● http://www.hhvm.com/
24. No!
● Namespaces in PHP are just class-prefixes
● They are added to each classname by the
compiler
● The result is called a FQCN - Fully Qualified
Class Name
32. Cool. Traits are for...
● Code reusage
● Multiple inheritance
● Keeping stuff you often use in different
contexts
● No need for complex OOP architectures
36. No. Because traits are...
● Copied into every single class at compile-
time
● Therefore not runtime bindable
● Not testable
● Tightly coupled
● Make it easier to cross SRP (one god-class)
