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 thehell_world()function Greeting string. You need to add some code tohello.candphp_hello.h, and make some key changes to thehell_module_entrystructure.

Related learning recommendations:PHP programming from entry to proficiency

1. The first step: modifyphp_hello.hClose 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 thehello.cfile

to remove the ## in the current version #hello_module_entryReplace 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; }

#includes at the top of the filehello.cAdd a#includenext 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"

hello_worldto use the value ofINI:

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

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.

• is actually using

  INI_STR()to obtain thehello.greetingentry 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 likeini_sethard to use.

The above is the detailed content of How to initialize extensions in PHP?. For more information, please follow other related articles on the PHP Chinese website!