PHP Opcache Explained
summary
OPCache arrives with PHP 5.5 and runs on 5.3–5.5, it stores compiled opcodes so PHP bypasses repeated parse/compile work and serves much faster execution; the Optimizer performs constant folding, dead-branch elimination and temporary reuse so runtime work shrinks. OPCache caches compiled opcodes in shared memory and requires sizing (memory and max_accelerated_files defaults to 2000 while Symfony needs ~3000); priming after deploy avoids costly first-hit compilation, wasted entries trigger restarts, and do not combine OPCache with APC or Xdebug.
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chapters (34)
- 0:00Introduction
- 3:17What is PHP
- 4:55How does PHP work
- 5:45Virtual Machine
- 7:59Passing and Compile
- 9:19Compile time
- 10:52Classes
- 12:47Cash Opcache
- 13:16Load Opcache from Shared Memory
- 13:31PHP
- 15:40Opcodes
- 19:36PHP Code
- 24:54Appa
- 27:47Examples
- 31:53Complex Code
- 32:58Post incrementation
- 34:19Reusing temporary variables
- 35:30Constant substitution
- 36:47Compilation
- 38:04Invariant Motion
- 38:27String
- 39:13Optimization
- 40:30Opcache API
- 41:06Opcache Settings
- 41:49Opcache Statistics
- 42:21Opcache Keys
- 43:12Cached Keys
- 43:51Cash
- 45:18Why restart
- 45:43Opcache log
- 46:03Fast shut down
- 46:43Consistency check
- 48:26Questions
- 51:54Stats
