java - What is the difference between using global directly and using use to pass variables in external space in PHP anonymous functions?

What is the difference between using global directly in PHP’s anonymous function and using use to pass variables in external space?

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What is the difference between using global directly in PHP’s anonymous function and using use to pass variables in external space?

The variables of the closure function use will not affect global variables.

<code><?php
$global = $global2= 'hello';
$fun = function() use ($global){
    $global.=' world!';
    global $global2;
    $global2.=' world!';
};
$fun();
echo $global."\n";
//hello
echo $global2;
//hello world!
</code>