How to initialize extensions in PHP?

PHP initialization extension method: first modify the prototype declaration near the user space function in [php_hello.h]; then modify the [hello.c] file; then add a [# at the top of the file [hello.c] include]; finally modify [hello_world] to use the value of INI.

How to initialize the extension in PHP:

Initialize the configuration of the extension through php.ini

Zend engine provides two ways to manage ini values.

Suppose you want to define a value in php.ini for your extension, hello.greeting, which holds the value that will be used in the hell_world() function Greeting string. You need to add some code to hello.c and php_hello.h, and make some key changes to the hell_module_entry structure.

Related learning recommendations: PHP programming from entry to proficiency

1. The first step: modify php_hello.h Close to the prototype declaration of the user space function

 PHP_MINIT_FUNCTION(hello);
PHP_MSHUTDOWN_FUNCTION(hello);// 初始化关键点
PHP_FUNCTION(hello_world);// 其它通用
PHP_FUNCTION(hello_long);

2. Step 2: Modify the hello.c file

to remove the ## in the current version #hello_module_entry Replace it with the following list:

zend_module_entry hello_module_entry = {
     #if ZEND_MODULE_API_NO >= 20010901
          STRANDARD_MODULE_HEADER,
     #endif
          PHP_HELLO_WORLD_EXTENAME,
          hello_functions,
          PHP_MINIT(hello),
          PHP_MSHUTDOWN(hello),
          NULL,NULL,NULL,
     #if ZEND_MODULE_API_NO >= 20010901
          PHP_HELLO_WORLD_VERSION,
     #endif
          STANDARD_MODULE_PROERTIES
}
 
PHP_INI_BEGIN()
PHP_INI_ENTRY("hello.greeting","hello world",PHP_INI_ALL,NULL)
PHP_INI_END()
 
PHP_MINIT_FUNCTION(hello)
{
     REGISTER_INI_ENTRIES();
     return SUCCESS;
}
 
PHP_MSHUTDOWN_FUNCTION(hello)
{
     UNREGISTER_INI_ENTRIES();
     return SUCCESS;
}

3. Now, you only need the

#includes at the top of the file hello.c Add a #include next to , so that the correct header file that supports INI can be activated:

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "php.h"
#include "php_ini.h"
#include "php_hello.h"

4. Finally, you You can modify

hello_world to use the value of INI:

PHP_FUNCTION(hello_world)
{
     RETURN_STRING(INI_STR("hello.greeting"),1);
}

However: you will have to copy from

INI_STR()The value returned. This is because, before entering the PHP variable stack, it is a static string. In fact, if you try to modify the returned string, the PHP execution environment will become unstable or even crash.

Summary:

• is actually using

  INI_STR() to obtain the hello.greeting entry The current string.

• If you want to get other parameters, you can use functions like

  INI_INT, etc. Due to different setting parameters, it may cause functions like ini_set hard to use.

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