This is where the OPcache extension comes in to play: This may result in wasting CPU resources and additional time.
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This means, when a PHP script runs, the interpreter parses, compiles, and executes the code over and over again on each request. So, how does OPcache make PHP faster? And what changes in the execution process with JIT? The following image shows a visual representation of the basic PHP execution process. Interpretation: Opcodes are interpreted and run on the Zend VM.
Compilation: The interpreter traverses the tree and translates AST nodes into low-level Zend opcodes, which are numeric identifiers determining the type of instruction performed by the Zend VM.Parsing: The interpreter checks if the script matches the syntax rules and uses tokens to build an Abstract Syntax Tree (AST), a hierarchical representation of the structure of source code.Lexing/Tokenizing: First, the interpreter reads the PHP code and builds a set of tokens.To better understand what JIT is for PHP, let’s take a quick look at how PHP executes the source code to the final result. So, how did we get to JIT, and what is the difference between JIT vs OPcache? When enabled, native code of PHP files is stored in an additional region of the OPcache shared memory and op_array→opcodes.handler(s) keep pointers to the entry points of JIT-ed code.” It may be enabled/disabled at PHP compile time and at run-time. “PHP JIT is implemented as an almost independent part of OPcache. The RFC proposal describes JIT as follows: The most acclaimed feature coming with PHP 8 is the Just-in-time (JIT) compiler.
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