示例
<?php
$a = 1;
$c = 'a';
$d = 'c';
$e = 'd';
$f = 'e';
echo $ $ $ $$f;//运行显示1
话语的服侍
示例
<?php
$a = 1;
$c = 'a';
$d = 'c';
$e = 'd';
$f = 'e';
echo $ $ $ $$f;//运行显示1发表于: 2020-01-14 17:49:28