Shulou(Shulou.com)05/31 Report--

php extension writing is what, many novices are not very clear about this, in order to help you solve this problem, the following small series will be explained in detail for everyone, there are people who need this to learn, I hope you can gain something.

Why extend with C?

C is statically compiled and executes much more efficiently than PHP code. The same computing code, developed in C, will perform hundreds of times better than PHP. IO operations such as CURL, because the time is mainly on IOWait, C extension has no obvious advantage.

In addition, the C extension is loaded at the start of the process, PHP code can only operate on the data of the Request life cycle, and the C extension can operate on a wider range.

the first step

Download PHP source code, such as PHP-5.4.16. Unzip and go to php-5.4.16\ext directory. Enter./ ext_skel -extname=myext, myext is the name of the extension, and the myext directory is generated after execution.

ext_skel is an official PHP tool for generating skeleton code for PHP extensions.

cd myext。You can see php_myext.h, myext.c, config.m4, etc. config.m4 is the configuration file for the AutoConf tool, which is used to modify various compilation options.

the second step

Modify config.m4 to

dnl PHP_ARG_WITH(myext, for myext support, dnl Make sure that the comment is aligned: dnl [ --with-myext Include myext support])

modified to

PHP_ARG_WITH(myext, for myext support, [ --with-myext Include myext support])

There is also a-enable-myext below, which means compiled into the PHP kernel. with is loaded as a DLL.

the third step

Modify php_myext.h to see PHP_FUNCTION(confirm_myext_compiled); here is the extension function declaration section, you can add PHP_FUNCTION(myext_helloworld); indicates that a myext_helloworld extension function is declared.

Then modify myext.c, which is the implementation part of the extension function.

const zend_function_entry myext_functions[] = { PHP_FE(confirm_myext_compiled, NULL) /* For testing, remove later. */ PHP_FE(myext_helloworld, NULL) PHP_FE_END /* Must be the last line in myext_functions[] */ };

This code registers the function pointer to the Zend engine, adding PHP_FE(myext_helloworld, NULL)(no semicolon).

the fourth step

Add myext_helloworld execution code to the end of myext.c.

PHP_FUNCTION(myext_helloworld) { char *arg = NULL; int arg_len, len; char *strg; if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s", &arg, &arg_len) == FAILURE) { return; } php_printf("Hello World!\ n"); RETRUN_TRUE; }

zend_parameter_parameters is used to accept parameters passed by PHP, RETURN_XXX macro is used to return data to PHP.

the fifth step

Run phpize,./in myext directory configure 、make、make install。Then modify php.ini to add extension= myext.so

Run php -r "myext_helloworld ('test ');" and output hello world!

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