为什么Perl有这么多的“魔术”？

通过 perlsub和 perlop联机帮助页,我注意到有很多“魔术”和“魔术”的引用(只需搜索“魔术”).我不知道为什么Perl如此丰富.

一些例子：

print ++($foo = 'zz')            # prints 'aaa'       
printf "%d: %s",$! = 1,$!      # prints '1: Operation not permitted'
while (my $line = <FH>) { ... }  # $line is tested for definedness,not truth
use warnings; print "0 but true" + 1  # "0 but true" is a valid number!

25  site:ruby-doc.org     magic
 36  site:docs.python.org  magic
497  site:perldoc.perl.org magic