PHP extension development: How to interact custom functions with external languages?

Through PHP extensions, custom functions can be interacted with external languages. Specific steps include: creating a PHP extension module directory and writing a C file; registering a custom function in the C file; compiling the extension; installing the extension; calling the function defined in the extension, such as calling the C function sum in the case, and printing the result.

PHP extension development: interacting custom functions with external languages

In PHP, custom functions can be extended Interact seamlessly with other languages. This article will guide you step-by-step on how to create and use a PHP extension to call external C functions.

Step 1: Create an extension

First, create a PHP extension module directory:

$ mkdir php_ext_example

Go into this directory and create a php_ext_example. c File:

#include <php.h>
#include <stdlib.h>

PHP_FUNCTION(ext_fn)
{
    // ... 自定义函数的实现

    RETURN_STRING("调用成功！");
}

Step 2: Register the function

Next, register the custom function in the php_ext_example.c file:

static int ext_example_init(INIT_FUNC_ARGS)
{
    zend_declare_function(ZEND_REGISTER_MODULE_GLOBALS(ext_example),
        "ext_fn", ext_fn, ZEND_FN(ext_fn), 0, NULL);

    return SUCCESS;
}

Step 3: Compile the extension

Compile the extension using the following command:

$ phpize && ./configure && make

Step 4: Install the extension

$ sudo cp modules/php_ext_example.so /usr/lib/php/20230904/

Practical case: Calling a C function

Suppose we have a C function named sum that accepts two integer parameters and returns their sum. We can use an extension in PHP to call this function:

<?php
// 检查扩展是否加载
if (extension_loaded('php_ext_example')) {
    // 调用扩展中定义的函数
    $result = ext_fn(10, 20);
    echo "结果：$result";
}

Output

结果：30

The above is how to use an extension in PHP to interact a custom function with a C function method. You can use this technology to interact with any external language, such as Python, Java, or JavaScript.

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