一个php语法的问题

Question

看到一个代码不懂什么意思，求大神解答
foreach($GLOBALS AS $_k=>$_v) {
${$_k} = $_v;
}

Answer 1

[code="php"]
foreach($GLOBALS AS $_k=>$_v) {
${$_k} = $_v;
}
[/code]
${$_k} 可变变量
这时说的很清楚[url]http://www.php.net/manual/zh/language.variables.variable.php[/url]