How can I write PHP opcode, save it in a file and make the Zend Engine execute it? Any method or hack is welcome, as long as it does the trick.
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at "no well-intentioned answers that are not precisely addressing [the] question". Are miserable or angry answers that don't address the question acceptable? – halfer Nov 30 '11 at 13:25
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@halfer ... look at Mo.sch's answer ... PHP-questions always attract such answers ... and did you -1 one me? oh man ... – Raffael Nov 30 '11 at 13:31
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1No, no -1 from me; I always try to state why I downvote :) – halfer Nov 30 '11 at 13:57
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2Why downvote? It's a perfectly valid (and interesting) question. – N.B. Nov 30 '11 at 14:01
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1@N.B. - yes, it's a good question. The downvotes may have been for the way the question was originally asked, but it has now been nicely improved. – halfer Nov 30 '11 at 15:04
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There's a couple of user-space methods (from plugins) that can deal with Opcodes.
- http://uk.php.net/apc_bin_load (and http://uk.php.net/apc_bin_dump)
- http://uk.php.net/bcompiler_read / http://uk.php.net/bcompiler_write_file
Neither produces plain text however because the opcodes are not designed to be a user-writable language (unlike Parrot).
Alister Bulman
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that means I could overwrite a cached file with apc_bin_load, I guess ... so next question would be how the nice looking opcode statements relate to the actually used binary representation. do you know something about that? references or so? – Raffael Nov 30 '11 at 16:02
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http://stackoverflow.com/questions/1795425/how-to-get-opcodes-of-php has some information, mostly referring to "Vulcan Logic Dumper" - http://pecl.php.net/package/vld – Alister Bulman Nov 30 '11 at 17:49
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There is an extension called ulopcodes that allows you to emit your own opcodes via a function that it exposes to PHP code.
For example:
ulopcodes_emit(ZEND_ECHO, "Hello world!");
Will create that line in the current oparray which will be executed by the VM.
This extension is purely educational and not intended to be used in production code.
(Disclaimer: I am the creator of ulopcodes)
pmmaga
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Yes, you can use [vld](https://github.com/derickr/vld) for instance to output the generated opcodes. – pmmaga Jan 16 '17 at 14:51