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PHP. Руководство по PHP. 2005

PHP bytecode CompilerПред.

След.

VI. PHP bytecode Compiler

Введение

Внимание
Это расширение является

ЭКСПЕРИМЕНТАЛЬНЫМ. Поведение этого расширения,

включая имена его функций и относящуюся к нему документацию, может

измениться в последующих версиях PHP без уведомления. Используйте

это расширение на свой страх и риск.

Bcompiler was written for two reasons:

To encode entire script in a proprietary PHP application
To encode some classes and/or functions in a proprietary PHP application
- To enable the production of php-gtk applications that could be used on client desktops, without the need for a php.exe.
To do the feasibility study for a PHP to C converter

The first of these goals is achieved using the bcompiler_write_header(), bcompiler_write_file() and bcompiler_write_footer() functions. The bytecode files can be written as either uncompressed or plain. To use the generated bytecode, you can simply include it with include or require statements.

The second of these goals is achieved using the bcompiler_write_header(), bcompiler_write_class(), bcompiler_write_footer(), bcompiler_read(), and bcompiler_load() functions. The bytecode files can be written as either uncompressed or plain. The bcompiler_load() reads a bzip compressed bytecode file, which tends to be 1/3 of the size of the original file.

To create EXE type files, bcompiler has to be used with a modified sapi file or a version of PHP which has been compiled as a shared library. In this scenario, bcompiler reads the compressed bytecode from the end of the exe file.

bcompiler can improve performance by about 30% when used with uncompressed bytecodes only. But keep in mind that uncompressed bytecode can be up to 5 times larger than the original source code. Using bytecode compression can save your space, but decompression requires much more time than parsing a source. bcompiler also does not do any bytecode optimization, this could be added in the future...

In terms of code protection, it is safe to say that it would be impossible to recreate the exact source code that it was built from, and without the accompanying source code comments. It would effectively be useless to use the bcompiler bytecodes to recreate and modify a class. However it is possible to retrieve data from a bcompiled bytecode file - so don't put your private passwords or anything in it.

Установка

short installation note:

  • You need at least PHP4.3. for the compression to work
  • To install on PHP4.3 and later at the unix command prompt type pear install bcompiler
  • To install on Windows, until the binary package distribution mechanism is finished please search the archives of the pear-general mailing list for pre-built packages. (or send an email to it if you could not find a reference)
  • To install on older versions you need to make some slight changes to the build.
  • untar the bcompiler.tgz archive into php4/ext.(Get it directly from PECL http://pecl.php.net/get/bcompiler)
  • If the new directory is now called something like bcompiler-0.x, then you should rename it to bcompiler (except you only want to build it as self-contained php-module).
  • If you are using versions before PHP4.3, the you will need to copy the Makefile.in.old to Makefile.in and config.m4.old to config.m4.
  • run phpize in - ext/bcompiler
  • run ./buildconf in php4
  • run configure with - --enable-bcompiler (and your other options)
  • make; make install
  • that's it.

    Contact Information

    . Any help is very welcome.

    Содержание

    bcompiler_load_exe -- Reads and creates classes from a bcompiler exe file

    bcompiler_load -- Reads and creates classes from a bz compressed file

    bcompiler_parse_class -- Reads the bytecodes of a class and calls back to a user function

    bcompiler_read -- Reads and creates classes from a filehandle

    bcompiler_write_class -- Writes an defined class as bytecodes

    bcompiler_write_constant -- Writes a defined constant as bytecodes

    bcompiler_write_exe_footer -- Writes the start pos, and sig to the end of a exe type file

    bcompiler_write_file -- Writes a php source file as bytecodes

    bcompiler_write_footer -- Writes the single character \x00 to indicate End of compiled data

    bcompiler_write_function -- Writes an defined function as bytecodes

    bcompiler_write_functions_from_file -- Writes all functions defined in a file as bytecodes

    bcompiler_write_header -- Writes the bcompiler header

    Пред.

    Начало

    След.

    bcsub

    Уровень выше

    bcompiler_load_exe

  • Отвечу на любые вопросы. С уважением, Дмитрий Владимирович.

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