在PHP中使用匿名函数

Question

This question may be silly. But an anonymous function does not really seem that anonymous to me. Maybe I am understanding it wrong, but an anonymous function must be stored in some variable, so it can later be referenced by this variable. If this is the case, what makes the below function so anonymous or so different than a regular function (other than the ability to store the function itself in a variable)? Or to word it differently, how is an anonymous function MORE useful than a regular function?

<?php
$greet = function($name)
{
    printf("Hello %s
", $name);
};

function greet($name)
{
     printf("Hello %s
", $name);
}

$greet('World');
$greet('PHP');

greet('World');
greet('PHP');
?>

Answer 1

The function itself has no name, as you show in your example you can still create a "real" function with the "same name". They're usually used like this as callbacks, which may seem more "anonymous":

foo(function ($bar) { ... });