Removed some whitespace, added default variable and placed the code in a subroutine.
#!/usr/bin/perl -w
if (luhn()==0) { print "valid\n"; } else { print "not valid\n"; }
sub luhn
{
1 2 3 4 5 6
+7 8 9 10 11 12
0123456789012345678901234567890123456789012345678901234567890123456789
+01234567890123456789012345678901234567890123456789012
$n='4564123800603607';$o=$_=reverse$n;$o=~s/.(.)/$1*2/ge;s/(.)./$1/ge;
+$o=~s/(.)/$x+=$1/ge;s/(.)/$y+=$1/ge;return($x+$y)%10;
}
metadoktor
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