摘要：1、可变变量的情况 可见，与大部分资料一样，变量使用大括号的情况，在于“可变变量”（Variable variables）。其中提到： 引用 In order to use variable variables with arrays, you have to resolve an ambiguity problem. That is, if you write $$a[1] then the parser needs to know if you meant to use $a[1] as a variable, or if you wanted $$a as the variable an
阅读全文
posted @ 2011-11-11 09:32
