perl - 已经使用严格时是否有必要使用警告？

Question

代码如下:

use strict;
use warnings;

是 use warnings;这里有必要吗？

Answer 1

是的，这是必要的。
use strict和 use warnings做不同的事情。

来自 strict模块的手册页:

strict − Perl pragma to restrict unsafe constructs

来自 perlrun (对于 -w ):

prints warnings about dubious constructs, such as variable names that are mentioned only once and scalar variables that are used before being set, redefined subroutines, references to undefined filehandles or filehandles opened read-only that you are attempting to write on, values used as a number that don't look like numbers, using an array as though it were a scalar, if your subroutines recurse more than 100 deep, and innumerable other things.