PHP extension development: How to load custom functions into the PHP runtime environment?

Custom functions need to be loaded into the PHP running environment, which can be achieved by writing PHP extensions. The steps are as follows: 1. Use C language or assembly language to write an extension module, including the implementation of custom functions; 2. Create a declaration file, declare function list and configuration options; 3. Add the extension loading path in php.ini; 4. Re- Load PHP. In the demonstration case, the my_extension extension is created, including the my_custom_function function, which is used to add two numbers.

PHP extension development: loading custom functions into the PHP running environment

In PHP development, sometimes it is necessary to Customized functions are loaded into the PHP runtime environment for calls by other code. This can be achieved by writing a PHP extension.

PHP extension is a dynamically loaded binary module that extends PHP's built-in functionality. Creating an extension requires the following steps:

1. Write an extension module

Write a PHP extension module using C language or assembly language, which will contain the implementation of the custom function .

ZEND_FUNCTION(my_custom_function) {
  // 函数实现
}

2. Create an extension declaration file

Create an extension declaration file (.h), which contains extension module information, such as functions List and configuration options.

PHP_FUNCTION(my_custom_function);
ZEND_BEGIN_ARG_INFO_EX(arginfo_my_custom_function, 0, 0, 0)
  ZEND_ARG_INFO(0, arg1)
ZEND_END_ARG_INFO()

3. Register the extension

Add the following lines in the php.ini file to load the extension into the PHP environment:

extension=my_extension.so

4. Reload PHP

Restart or reload the PHP application so that the extension can take effect.

Practical Case

To demonstrate how to use a custom PHP extension, we create a my_extension extension, which contains a function named my_custom_function function that adds two numbers:

my_extension.c

ZEND_FUNCTION(my_custom_function) {
  zend_long arg1, arg2;

  if (zend_parse_parameters(ZEND_NUM_ARGS(), "ll", &arg1, &arg2) == FAILURE) {
    RETURN_NULL();
  }

  RETURN_LONG(arg1 + arg2);
}

my_extension.h

PHP_FUNCTION(my_custom_function);
ZEND_BEGIN_ARG_INFO_EX(arginfo_my_custom_function, 0, 0, 2)
  ZEND_ARG_INFO(0, arg1)
  ZEND_ARG_INFO(0, arg2)
ZEND_END_ARG_INFO()

php.ini

extension=my_extension.so

In the index.php file, you can call the my_custom_function function:

$result = my_custom_function(10, 20);
echo $result; // 输出 30

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