note 68755 deleted from ref.bc by betz
| From: | betz@php.net | Date: | Wed, 09 Aug 2006 17:19:35 +0000 |
| Subject: | note 68755 deleted from ref.bc by betz | ||
| References: | 1 | Groups: | php.notes |
| Request: | Send a blank email to php-notes+get-115733@lists.php.net to get a copy of this message | ||
Note Submitter: marcus at synchromedia dot co dot uk
----
An amendment to the entry by pulstar at mail dot com - the digits() function can be made much faster
(remove the line breaks from the big string, and make sure you don't miss any characters!):
function digits2($base) {
if($base < 64) {
$digits = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ-_';
} else {
$digits = "\x0\x1\x2\x3\x4\x5\x6\x7\x8\x9\xa\xb\xc\xd\xe\xf
\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f !
\"#\x24%&'()*+,-./0123456789:;<=>?
@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz
{|}~\x7f\x80\x81\x82\x83\x84\x85\x86\x87\x88\x89\x8a\x8b\x8c\x8d
\x8e\x8f\x90\x91\x92\x93\x94\x95\x96\x97\x98\x99\x9a\x9b\x9c\x9d
\x9e\x9f\xa0\xa1\xa2\xa3\xa4\xa5\xa6\xa7\xa8\xa9\xaa\xab\xac\xad
\xae\xaf\xb0\xb1\xb2\xb3\xb4\xb5\xb6\xb7\xb8\xb9\xba\xbb\xbc\xbd
\xbe\xbf\xc0\xc1\xc2\xc3\xc4\xc5\xc6\xc7\xc8\xc9\xca\xcb\xcc\xcd
\xce\xcf\xd0\xd1\xd2\xd3\xd4\xd5\xd6\xd7\xd8\xd9\xda\xdb\xdc\xdd
\xde\xdf\xe0\xe1\xe2\xe3\xe4\xe5\xe6\xe7\xe8\xe9\xea\xeb\xec\xed
\xee\xef\xf0\xf1\xf2\xf3\xf4\xf5\xf6\xf7\xf8\xf9\xfa\xfb\xfc\xfd\xfe
\xff";
}
return substr($digits, 0, $base);
}
in my benchmarks, this is around 150x faster for 256 digits