ID: 33418 Updated by: [EMAIL PROTECTED] Reported By: alex-spam at rdc dot ru Status: Open Bug Type: Feature/Change Request Operating System: all PHP Version: 4.3.11 New Comment:
New OpArrays (like your eval thing returns) can only be executing by calling a function (or something that resembles it very closely)... so you're not gaining anything here. Previous Comments: ------------------------------------------------------------------------ [2005-06-21 12:43:39] alex-spam at rdc dot ru create_function() will create a _function_. When we're talking tough optimization, every extra function call is an issue. On 10k calls strcmp() is MUCH slower than '==' operator on strings. Function calls are quite expensive in PHP. The context is switched and caller's variables become invisible. Precompiled eval()s would allow to unroll small loops without changing the context, which is also important. What do you think? ------------------------------------------------------------------------ [2005-06-21 11:36:32] [EMAIL PROTECTED] You could use create_function() to create your dynamic code and execute the returned function. No need for a new function. ------------------------------------------------------------------------ [2005-06-21 11:13:35] alex-spam at rdc dot ru Description: ------------ From: Alex Fortuna My proposal, if accepted and implemented, will allow for ever tougher optimization of processing-intensive PHP scripts. I think it would be great if, in addition to existing eval() function, a pair of functions were implemented, like: int eval_prepare (string $code); bool eval_exec (int $handle); eval_prepare() compiles a piece of code and stores it in engine's memory under an integer handle. You call it once outside the processing loop. eval_exec() executes the given handle's code. You call it INSIDE the processing loop. The reason is practical: sometimes the programmer KNOWS how to optimize a piece of code, but he CAN'T, since certain parts of it are dynamic. For example, actual string token values may differ from call to call, though processing logic is always the same. The possibility to separately compile and execute script-generated PHP code will give programmers a unique chance to achieve ever greater script performance, the demand for which is continuosly growing. I've made some prototype performance benchmarks on a script which parses syntax. The results were amazing: about 2 to 3 times performance increase without extra script complexity. If you need a working example, please write via e-mail. Thank you for your time. Best regards, Alex Reproduce code: --------------- . Expected result: ---------------- . Actual result: -------------- . ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=33418&edit=1