Note Submitter: thegreatall at gmail dot com
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If you want to generate an EXTREMELY FAST random serial using '0123456789abcdefghijklmnopqrstuvwxyz' you can use:
<?php
base_convert(mt_rand(0, 0x38E38E38E38E38E), 10, 36);
?>
You may need to change the 0x38E38E38E38E38E to whatever your (PHP_INT_MAX / 36) is. that number is for 64 bit machines, 32 bit machines will be: 0x38E38E3. on on 64 bit machines it gives roughly between a 1 to 12 character number. on a 32 bit machine it will return roughly 1 to 5 characters.
If you do some simple math you can get it to always return a certain number of characters.
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