Detailed introduction to hello world in php extension
Preface
This is a memo that I have been wanting to write for a long time. Writing PHP extensions is full of articles, but many of them are very old. Yes. Some examples don't work. It's a bit embarrassing.
This article is used to record your own notes as a memo.
Text
1. Download the php installation package
Download address: php download quick link
This article selects the php-5.6.7 installation package.
After that install php.
2. Create an extended skeleton
//跑到ext目录cd php-5.6.7/ext///执行一键生成骨架的操作./ext_skel --extname=helloworld
If you see the following prompt indicating the creation result
cd helloworld ls
you will find the following files:
config.m4 config.w32 CREDITS EXPERIMENTAL helloworld.c helloworld.php php_helloworld.h tests
3. Modify the extended configuration file config.m4
Remove the dnl before the following code. (dnl is equivalent to php's //)
##动态编译选项,通过.so的方式链接,去掉dnl注释PHP_ARG_WITH(helloworld, for helloworld support, Make sure that the comment is aligned: [ --with-helloworld Include helloworld support])##静态编译选项,通过enable来启用,去掉dnl注释PHP_ARG_ENABLE(helloworld, whether to enable helloworld support, Make sure that the comment is aligned: [ --enable-helloworld Enable helloworld support])
Generally, you can choose one of the two (it depends on personal preference, the enable comment must be removed in this tutorial).
4. Perform compilation test
phpize ./configure --enable-helloworldmakemake install
Then add the extension to php.ini
vim /usr/local/php/etc/php.ini// 添加扩展extension_dir = "/usr/local/php/lib/php/extensions/no-debug-non-zts-20131226/"extension = "helloworld.so"// 重启php-fpm/etc/init.d/php-fpm restart
Go back to the folder where the extension was written and execute the test command
php -d enable_dl=On myfile.php
Seeing the following words indicates that victory is not far away:
confirm_helloworld_compiled Congratulations! You have successfully modified ext/helloworld/config.m4. Module helloworld is now compiled into PHP.
confirm_helloworld_compiled is a test function automatically generated by ext_skel.
ps: If two PHP versions are installed locally and the extension is written in PHP7, you may encounter the following problems:
/mydata/src/php-7.0.0/ext/helloworld/helloworld.c: 在函数‘zif_confirm_helloworld_compiled’中: /mydata/src/php-7.0.0/ext/helloworld/helloworld.c:58: 错误:‘zend_string’未声明(在此函数内第一次使用) /mydata/src/php-7.0.0/ext/helloworld/helloworld.c:58: 错误:(即使在一个函数内多次出现,每个未声明的标识符在其 /mydata/src/php-7.0.0/ext/helloworld/helloworld.c:58: 错误:所在的函数内也只报告一次。) /mydata/src/php-7.0.0/ext/helloworld/helloworld.c:58: 错误:‘strg’未声明(在此函数内第一次使用)
Cause: The compilation environment is not PHP7.
Solution: There is no zend_string type in php5, replace it with char, or modify your php version environment to php7
5. Create helloworld function
Edit helloworld.c, add the following Implemented function
##zend_function_entry helloworld_functions 补充要实现的函数const zend_function_entry helloworld_functions[] = { PHP_FE(confirm_helloworld_compiled, NULL) /* For testing, remove later. */ PHP_FE(helloworld, NULL) /* 这是补充的一行,尾巴没有逗号 */ PHP_FE_END /* Must be the last line in helloworld_functions[] */};
Find "PHP_FUNCTION(confirm_helloworld_compiled)", start another function to write the function entity:
PHP_FUNCTION(helloworld) { php_printf("Hello World!\n"); RETURN_TRUE; }
Go through the compilation again:
./configure --enable-helloworld && make && make install
Test whether it is true The success:
php -d enable_dl=On -r "dl('helloworld.so');helloworld();"//输出Hello World!
Success!
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