PHP静态闭包和非静态闭包之间的差异

<?php
class Foo {
        protected $array;

        public function __construct() {
        $this->array = array_fill(0, 2000, 17);
        }

        public function getItemProcessor(): Closure {
        return function () {
            // do some processing unrelated to $this
        };
        }
}

$start = microtime(true);
$processors = [];
for ($i = 0; $i < 2000; $i++) {
    $foo = new Foo();
    $processors[] = $foo->getItemProcessor();
}

$memory = memory_get_usage() >> 20;
$time = (microtime(true) - $start) * 1000;
printf("This took %dms and %dMB of memory\n", $time, $memory);

<?php
class Foo {
        protected $array;

        public function __construct() {
        $this->array = array_fill(0, 2000, 17);
        }

        public function getItemProcessor(): Closure {
        return static function () {
            // do some processing unrelated to $this
        };
        }
}

$start = microtime(true);
$processors = [];
for ($i = 0; $i < 2000; $i++) {
    $foo = new Foo();
    $processors[] = $foo->getItemProcessor();
}

$memory = memory_get_usage() >> 20;
$time = (microtime(true) - $start) * 1000;
printf("This took %dms and %dMB of memory\n", $time, $memory);