使用純Perl語言（不須要任何模塊）編寫生成驗證碼圖片的程序

使用純Perl語言（不須要任何模塊）編寫生成驗證碼圖片的程序，完整代碼以下：

#!/usr/bin/perl

open (FILE, '>', 'image.png');
binmode (FILE);
print FILE &bmpNum (&myrand(9999));
close (FILE);

sub bmpNum{
my $verifynum=shift;
local @n0 = ("3c","66","66","66","66","66","66","66","66","3c");
local @n1 = ("1c","0c","0c","0c","0c","0c","0c","0c","1c","0c");
local @n2 = ("7e","60","60","30","18","0c","06","06","66","3c");
local @n3 = ("3c","66","06","06","06","1c","06","06","66","3c");
local @n4 = ("1e","0c","7e","4c","2c","2c","1c","1c","0c","0c");
local @n5 = ("3c","66","06","06","06","7c","60","60","60","7e"); local @n6 = ("3c","66","66","66","66","7c","60","60","30","1c"); local @n7 = ("30","30","18","18","0c","0c","06","06","66","7e"); local @n8 = ("3c","66","66","66","66","3c","66","66","66","3c"); local @n9 = ("38","0c","06","06","3e","66","66","66","66","3c"); for (my $i = 0; $i < 10; $i++) { for (1 .. 6) {     my $a1 = substr("012", int(myrand(3)), 1) . substr("012345", int(myrand(6)), 1);     my $a2 = substr("012345",int(myrand(6)),1) . substr("0123", int(myrand(4)), 1);     int(myrand(2)) eq 1 ? push(@{"n$i"}, $a1) : unshift(@{"n$i"},$a1);     int(myrand(2)) eq 0 ? push(@{"n$i"}, $a1) : unshift(@{"n$i"},$a2); } } my @bitmap = (); for (my $i = 0; $i < 20; $i++) { for (my $j = 0; $j < 4; $j++) {     my $n = substr($verifynum, $j, 1);     my $bytes = ${"n$n"}[$i];     my $a = int(myrand(15));     $a eq 1 ? $bytes =~ s/9/8/g : $a eq 3 ? $bytes =~ s/c/e/g : $a eq 6 ? $bytes =~ s/3/b/g : $a eq 8 ? $bytes =~ s/8/9/g : $a eq 0 ? $bytes =~ s/e/f/g : 1;     push(@bitmap, $bytes); } } for ($i = 0; $i < 8; $i++) { my $a = substr("012", int(myrand(3)), 1) . substr("012345", int(myrand(6)), 1); unshift(@bitmap, $a); push(@bitmap, $a); } my $image = '424d9e000000000000003e0000002800'; $image .= "00002000000018000000010001000000"; $image .= "00006000000000000000000000000000"; $image .= "00000000000000000000FFFFFF00"; $image .= join('', @bitmap); $image = pack ('H*', $image); return $image; } sub myrand {     my $max = shift;     my $result;     my $randseed = $LBCGI::randseed ;     $max ||= 1;     eval("\$result = rand($max);");     return $result unless ($@);     $randseed = time unless ($randseed);     my $x = 0xffffffff;     $x++;     $randseed *= 134775813;     $randseed++;     $randseed %= $x;     return $randseed * $max / $x; }