A detailed introduction to the PHP extension about Hello World

Objective

This is a long time to write a memo, writing PHP extension 100 degrees are articles, but a lot of articles are very old. Some of the examples are not running through. A little awkward.
This article is used to record your own notes as a memo.

Body

1. Download the PHP installation package

Download address: PHP Download fast Chain
This article selects the php-5.6.7 installation package.
Then install PHP.

2. Create an extended skeleton

Run to ext directory CD php-5.6.7/ext///perform one-click operation to build the skeleton./ext_skel--extname=helloworld

If you see the following tips for creating results

CD Helloworldls

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 code below. (DNL is equivalent to PHP//)

# #动态编译选项, link via. So, remove DNL comment 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, enabled by enable, remove DNL annotations php_arg_enable (HelloWorld, whether To enable HelloWorld Support,make Sure, the comment is aligned:[  --enable-helloworld           enable HelloWorld Suppor T])

In general, choose one (see a person's preference, this tutorial must remove the Enable comment).

4. Compile the test

Phpize./configure--enable-helloworldmakemake Install

Then add the extension to php.ini

vim/usr/local/php/etc/php.ini//Add extension extension_dir = "/usr/local/php/lib/php/extensions/no-debug-non-zts-20131226/ "Extension =" helloworld.so "//restart PHP-FPM/ETC/INIT.D/PHP-FPM restart

Go back to the Write extension folder and execute the test command

php-d Enable_dl=on myfile.php

See the following words stating that the victory is not far away:

confirm_helloworld_compiledcongratulations! You have successfully modified EXT/HELLOWORLD/CONFIG.M4. Module HelloWorld is now compiled to PHP.

Confirm_helloworld_compiled is a test function that Ext_skel automatically generates.

PS: If you install two PHP versions locally, and you are writing extensions with PHP7, you may encounter the following issues:

/MYDATA/SRC/PHP-7.0.0/EXT/HELLOWORLD/HELLOWORLD.C: In function ' zif_confirm_helloworld_compiled ':/mydata/src/php-7.0.0/ EXT/HELLOWORLD/HELLOWORLD.C:58: Error: ' zend_string ' is not declared (first used within this function)/mydata/src/php-7.0.0/ext/helloworld/ HELLOWORLD.C:58: Error: (even if multiple occurrences occur within a function, each undeclared identifier is in its/mydata/src/php-7.0.0/ext/helloworld/helloworld.c:58: Error: Within the function is also reported only once. )/mydata/src/php-7.0.0/ext/helloworld/helloworld.c:58: Error: ' STRG ' not declared (first use within this function)

Cause: The compiled environment is not PHP7.
Workaround: php5 There is no zend_string type, replace with char, or modify your PHP version environment to PHP7

5. Create the HelloWorld function

Edit the HELLOWORLD.C to supplement the function to be implemented

# #zend_function_entry Helloworld_functions Supplement to implement the function const Zend_function_entry helloworld_functions[] = {     Php_fe ( confirm_helloworld_compiled, NULL)/       * For testing, remove later. *    /Php_fe (HelloWorld,  null)/       * This is a supplementary line, the tail does not have a comma */php_fe_end/* Must is the last lines in  helloworld_functions[] */};

Find "Php_function (confirm_helloworld_compiled)" and 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 if it is really successful:

php-d enable_dl=on-r "DL (' helloworld.so '); HelloWorld ();" Output Hello world!

Success!