像JavaScript中一样，PHP中是否存在函数变量？

$var = 1;
$func = function( $arg ) use ($var) {
     return $arg + $var;
};

use

use

$

&

$var = 1;
$func = function() use ( &$var ) {
   $var = 42;
}
$func();
// $var == 42 now

$func = function($a, $b) {
    return $a + $b;
};

$result = $func(3, 4); // returns 7

$c = 5;
$func = function($a, $b) use ($c) {
    return ($a + $b) * $c;
};

$result = $func(3, 4); // returns 35

var c = 5;
var f = function(a, b) {
    return (a + b) * c;
};
var r = f(3, 4); // returns 35
c = 6;
r = f(3, 4); // returns 42

$c = 5;
$func = function($a, $b) use (&$c) {
    return ($a + $b) * $c;
};

$result = $func(3, 4); // returns 35
$c = 6;   
$result = $func(3, 4); // returns 42

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

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

$blabla = function($arg){
  ...
};