How to register a custom function for PHP?

PHP allows registration of custom functions through the following built-in methods: register_shutdown_function: Call the specified function at the end of the script. create_function: An anonymous function created and called immediately.

#How to register a custom function in PHP?

PHP provides built-in methods such as register_shutdown_function and create_function for registering custom functions.

register_shutdown_function

This method calls the specified function at the end of the script. It is often used for cleanup operations or logging.

// 注册一个名为 "my_shutdown_function" 的自定义函数
register_shutdown_function("my_shutdown_function");

// 自定义函数定义
function my_shutdown_function() {
    // 此代码将在脚本结束后执行
    echo "脚本已结束";
}

create_function

This method creates an anonymous function and calls it immediately. It is often used to create temporary callbacks.

// 创建一个匿名函数，输出 "Hello World"
$my_function = create_function("", "echo 'Hello World';");

// 调用匿名函数
$my_function();

Practical case

Register a custom function as the processing function at the end of the script:

<?php

// 注册一个处理结束的自定义函数
register_shutdown_function("cleanup");

// 自定义函数定义
function cleanup() {
    // 关闭数据库连接
    mysqli_close($db_connection);

    // 删除临时文件
    unlink("temp_file.txt");
}

// 脚本逻辑
// ...

?>

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