Table of Contents
Text
1. Download the php installation package
2. Create an extended skeleton
3. Modify the extended configuration file config.m4
4. Perform compilation test
5. Create helloworld function
Home Backend Development PHP Tutorial Detailed introduction to hello world in php extension

Detailed introduction to hello world in php extension

Aug 14, 2017 am 09:26 AM
php world


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
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If you see the following prompt indicating the creation result
Detailed introduction to hello world in php extension

cd helloworld
ls
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you will find the following files:

config.m4  config.w32  CREDITS  EXPERIMENTAL  helloworld.c  helloworld.php  php_helloworld.h  tests
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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])
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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
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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
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Go back to the folder where the extension was written and execute the test command

php -d enable_dl=On myfile.php
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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.
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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)
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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[] */};
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Find "PHP_FUNCTION(confirm_helloworld_compiled)", start another function to write the function entity:

PHP_FUNCTION(helloworld) {    php_printf("Hello World!\n");
    RETURN_TRUE;
}
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Go through the compilation again:

./configure --enable-helloworld && make && make install
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Test whether it is true The success:

php -d enable_dl=On -r "dl('helloworld.so');helloworld();"//输出Hello World!
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Success!

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