PHP register_shutdown_function（）使用匿名函数

Question

According to the manual http://php.net/manual/en/function.register-shutdown-function.php, register_shutdown_function() is implemented as:

<?php
function shutdown()
{
    // This is our shutdown function, in 
    // here we can do any last operations
    // before the script is complete.

    echo 'Script executed with success', PHP_EOL;
}

register_shutdown_function('shutdown');
?>

Could it be implemented as an anonymous function? If so, how?

Answer 1

Anonymous function are simply passed as an argument:

register_shutdown_function(function(){
    // Code
});

Note that this applies to every function, not only to register_shutdown_function();

The only differences between using a named function vs an anonymous one, is if you need to call this function outside the context of register_shutdown_function, at this point you need to use a named function (altho this is a rare edge case).