php 实现golang defer延迟执行（先进后出）

<?php

echo '开始 <br />';
$num = '1 <br />';
${__LINE__} = defer(function () use ($num) {
   echo $num;
});
echo ${__LINE__};

$num = '2 <br />';
${__LINE__} = defer(function () use ($num) {
    echo $num;
 });


 $num = '3 <br />';
 ${__LINE__} = defer(function () use ($num) {
     echo $num;
  });

echo '结束 <br />';

 function defer(callable $cb)
{

    return new class($cb)
    {
        public function __construct($fn)
        {
            $this->fn = $fn;
        }

        public function __destruct()
        {
            ($this->fn)();
        }
    };
}

输出

开始
结束
3
2
1

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