How to extend built-in functions in PHP

Through the PHP extension mechanism, we can customize built-in functions. Just create an extension file (such as myext.c) containing the extension function code, compile it (phpize, configure, make), and install it (make install). Then, use dl() to load the extension and call the custom function in your code. For example, my_add(10, 20) will return 30.

How to extend PHP built-in functions by extending custom functions

Introduction

PHP provides a large number of built-in functions, but sometimes these functions do not fully meet our needs. To solve this problem, we can use PHP's extension mechanism to extend the built-in functions.

Steps

1. Create an extension file: Use a text editor to create a file named myext.c file and add the following code to it:

#include <php.h>

PHP_FUNCTION(my_add) {
    long num1, num2;

    if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "ll", &num1, &num2) == FAILURE) {
        return;
    }

    RETURN_LONG(num1 + num2);
}

This function accepts two integer parameters and returns their sum.

2. Compile the extension: Copy the following command to the terminal and execute:

phpize
./configure
make

3. Install the extension: Copy the following command to the terminal and execute it:

make install

Practical case

Use extended custom functions in PHP:

<?php
// 加载扩展
dl('myext.so'); // 替换为扩展的实际文件路径

// 调用自定义函数
echo my_add(10, 20); // 输出：30
?>

Note

• Make sure the path to the extension file is correct.
• If an error occurs, please check whether the compilation and installation steps are correct.
• Make sure the extension is loaded.

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