php可变变量

第一种通过两个美元符$

$animal='turtles';
$turtles=103;

echo $$animal;

解析:$$animal的值为turtles,因此将这个值作为变量查找它的值，因此最后输出103

第二种通过大括号实现可变变量

$stooges=array('Moe','Larry','Curly');
$stooge_moe='Moses Horwitz';
$stooge_larry='Louis Feinberg';
$stooge_curly='Jerome Horwitz';
foreach($stooges as $s){
    echo "$s's real name was ${'stooge_'.strtolower($s)}.\n";
}

输出结果为:

Moe's real name was Moses Horwitz.
Larry's real name was Louis Feinberg.
Curly's real name was Jerome Horwitz.