PHP拓展开发
痛定思痛: 开始了解 PHP 拓展开发,下面这篇文章不错!照着文章讲的,终于实现了!
m.php的代码
浏览器访问 m.php 文件!(备注:在linux 命令行中 php -r 'cthulhu();' 是错误的)
但在浏览器访问是可以的!!
说明: 测试 成功!!
这个链接不错: https://www.simonholywell.com/post/2010/09/15-excellent-resources-for-php-extension-development/
----------------------------------------------------------------------------------------------
https://www.kchodorow.com/blog/2011/08/11/php-extensions-made-eldrich-hello-world/
PHP Extensions Made Eldrich: Hello, World!
This is part 2 of a 4-part tutorial on writing PHP extensions:
- Setting Up PHP – compiling PHP for extension development
- Hello, world! – your first extension
- Working with the API – the PHP C API
- Classes – creating PHP objects in C
First we need to think of a name for our extension. I’ve been reading some H.P. Lovecraft, so let’s call it “rlyeh”.
For our first extension, we’ll create a new function, cthulhu()
. When we call cthulhu()
(tee hee), PHP will print “In his house at R’lyeh dead Cthulhu waits dreaming.”
Cheat Sheet
If you don’t want to copy/paste all of the code, you can clone the Github repo for this tutorial and check out sections as you go.
$ git clone git://github.com/kchodorow/rlyeh.git
This part of the tutorial (Hello, world!) is the master branch. Stating in part 3, each “unit” has a branch: <branchname> at the beginning of the section. You can checkout this branch if you want to see the code example in context.
For example, if you see branch: oop, you’d do:
$ git checkout -b oop origin/oop
Then you can compare what you’re doing to the “ideal” example code.
Setting Up
Create a directory for your PHP extension, named “rlyeh”. This is where all of the source code for your extension will live.
$ mkdir rlyeh
$ cd rlyeh
A PHP extension consists of at least three files:
- “config.m4”, which contains compilation instructions for PHP
- “php_extname.c”: source code
- “php_extname.h”: a header file
Creating a config.m4 file is wholly lacking in interest, so just cut/paste the one below.
dnl lines starting with "dnl" are comments PHP_ARG_ENABLE(rlyeh, whether to enable Rlyeh extension, [ --enable-rlyeh Enable Rlyeh extension]) if test "$PHP_RLYEH" != "no"; then dnl this defines the extension
PHP_NEW_EXTENSION(rlyeh, php_rlyeh.c, $ext_shared) dnl this is boilerplate to make the extension work on OS X
case $build_os in
darwin1*.*.*)
AC_MSG_CHECKING([whether to compile for recent osx architectures])
CFLAGS="$CFLAGS -arch i386 -arch x86_64 -mmacosx-version-min=10.5"
AC_MSG_RESULT([yes])
;;
darwin*)
AC_MSG_CHECKING([whether to compile for every osx architecture ever])
CFLAGS="$CFLAGS -arch i386 -arch x86_64 -arch ppc -arch ppc64"
AC_MSG_RESULT([yes])
;;
esac fi
If you want to call your extension something else, global replace “rlyeh” with your extension’s name.
Now for the actual extension: create a file called php_rlyeh.c with the following content:
// include PHP API |
That’s a whole lotta template, but it’ll make more sense as you go along.
Learning PHP extension programming is sort of like learning Java as your first programming language: “type ‘public static void main’.” “Why? What does that even mean?” “It doesn’t matter, you’ll learn about it later.”
You also have to make a header file, to declare the cthulhu
function as well as the two extension info macros used in php_rlyeh.c (PHP_RLYEH_EXTNAME
and PHP_RLYEH_VERSION
).
Create a new file, php_rlyeh.h, and add a couple of lines:
|
You can change the version whenever you do a new release. It can be any string. It’s displayed when you do:
$ php --ri rlyeh
(once the extension is installed).
Speaking of, now all that’s left is to compile and install. Make sure that your custom-compiled-PHP is first in your PATH. If it isn’t, put it there before doing the rest of the install.
$ echo $PATH
$PHPDIR/install-debug-zts/bin:/usr/local/bin:/usr/bin
$ phpize
Configuring for:
PHP Api Version: 20090626
Zend Module Api No: 20090626
Zend Extension Api No: 220090626
$
$ ./configure
# lots of checks...
$
$ make
# compile... Build complete.
Don't forget to run 'make test'. $ make install
$
Installing shared extensions: $PHPDIR/install-debug-zts/lib/php/extensions/debug-zts-20090626/
Now, add your extension to your php.ini file. PHP is probably expecting a php.ini file in the lib/ subdirectory of your install directory ($PHPDIR/install-debug-zts/lib/php.ini). It probably doesn’t exist yet, so create a new php.ini file with one line:
extension=rlyeh.so
Now you should be able to use your function from PHP without importing, loading, or requiring anything. Do:
$ php -r 'cthulhu();'
In his house at R'lyeh dead Cthulhu waits dreaming.
Your first PHP extension is working!
Next up: a deep dive into the PHP API.
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