有一个perl程序,中state的用法错误

有一个perl程序,中state的用法错误
程序如下：
/usr/bin/perl
use strict;
sub greet{
state @people;
my $num;
foreach (@_){
push (@people,$_);
}
$num = @people;
if($num == 1){
print "\n你是第一个来的人!\n";
}else{
print "\n$people[$#people-1]已经比你先到了 \n";
}
}
###开始进行一些测试#########################
&greet("tom");
#greet("Lily");
#greet("wangzi");
报错：
Array found where operator expected at ./Geet1.pl line 5,at end of line
(Missing operator before )
syntax error at ./Geet1.pl line 5,near "state @people"
Global symbol "@people" requires explicit package name at ./Geet1.pl line 5.
Global symbol "@people" requires explicit package name at ./Geet1.pl line 8.
Global symbol "@people" requires explicit package name at ./Geet1.pl line 10.
Global symbol "@people" requires explicit package name at ./Geet1.pl line 14.
Global symbol "@people" requires explicit package name at ./Geet1.pl line 14.
Execution of ./Geet1.pl aborted due to compilation errors.