📅 最后修改于: 2022-03-11 14:54:07.235000 🧑 作者: Mango
代码示例1
${$variableName} or $$variableName;
//example:
$variableName = 'foo';
$foo = 'bar';
// The following are all equivalent, and all output "bar":
echo $foo;
echo ${$variableName};
echo $$variableName;