php可变变量

<?php

$change_name = "trans";     //声明变量$change_name

$trans = "You can see me!"; //声明变量$trans

echo $change_name ;         //输出变量$change_name

echo "<br>" ;

echo $$change_name ;     //通过可变变量输出$trans的值  相当于  echo $trans;

?>