PHP Under The Hood
summary
Explains exact claims and shows the tools and traces used: uses VLD (Vulcan Logic Dumper) to dump opcodes, inspects tokenization and the zend VM, and demonstrates that zval reference counting and copy‑on‑write drive memory and speed behavior. Gives concrete examples — a contrived hello world, opcode listings for method calls, and why ++$i avoids creating a temporary versus $i++ — and points out opcache and tiny opcode optimizations that actually change runtime.
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chapters (15)
- 0:00Introduction
- 1:50What is profiling
- 3:15What is bad code
- 5:05Tokenizing
- 6:45Inter interpolated vs non interpolated strings
- 7:38String creation
- 8:55VLD
- 10:00Opcodes
- 11:16Variables
- 13:54Global Code
- 17:08Eval
- 24:41Post increment
- 26:59String interpolation
- 29:11Function calls
- 31:39Method overloading
