PHP Opcode? What's that?
summary
Digs into how PHP code becomes tokens then an AST and finally opcodes, with concrete examples (a hello world that produces CONCAT opcodes and variable fetches) and explains the VM executing fixed opcode instructions. Demonstrates how the opcode cache validates files, how max file slots and memory affect misses, and how the small optimizer rewrites opcode sequences (multipathing) to cut steps. Covers the emerging JIT that turns hot opcodes to native machine code and the practical performance impact to expect.
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chapters (22)
- 0:00PHP opcode concepts
- 1:36PHP to opcode tokens
- 4:52PHP VM executes opcodes
- 7:08PHP extensions and functions
- 10:07Optimize PHP with opcode caching
- 14:34Temporary variables and memory
- 19:00Control structures and jumps
- 22:20Function calls execution flow
- 24:24OOP in PHP opcodes
- 25:11Optimize PHP with opcode flags
- 26:15Opcode caching mechanisms
- 29:36Cache invalidation and tuning
- 31:12Static analysis and optimization
- 33:24JIT compilation in PHP
- 35:13PHP opcodes in images
- 36:17Class autoloading efficiency
- 37:23Permanent memory in frameworks
- 38:07Opcode caching impact
- 38:47Opcode caching results
- 40:13Virtual variables myths
- 41:46Class loading and execution
- 42:30Opcode caching limits
