PHP匿名函数和JS匿名函数

<?php function php_shell(){    $arr = [9,8,7,6,5,4,3,2,1];    $func = function () use($arr){  //use(&$arr) 结果会不一样        return array_pop($arr);    };    return $func; } $func = php_shell(); for($i = 0 ; $i <= 6; $i++){    echo $func();    echo "<br/>/r/n"; } ?> <script>     function js_shell(){        var arr = [9,8,7,6,5,4,3,2,1];        var func = function(){            return arr.pop();        };        return func;     }     var func = js_shell();     for(var i = 0 ; i <= 6; i++){        console.log(func());     } </script>