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Created September 30, 2017 13:54
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opt_debug_level.md
opcache.opt_debug_level

Produces opcode dumps for debugging different stages of optimizations. php -d opcache.opt_debug_level=0x10000 test.php will output opcodes as the compiler produced them before any optimization occurs. 0x20000 will output optimized opcodes. 0x40000 will produce a control flow graph (CFG). 0x200000 will produce a type and range-inferred static single assignment (SSA) form.

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