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--- notes:md5 [2019-02-10 21:03] – [MD5 and shorter hashing techniques] roland
+++ notes:md5 [2019-02-10 21:07] (current) – [UPDATE (2018-04-06)] roland
@@ Line 45: / Line 45: @@
 After revisiting this article, I found a very detailed post about Youtube Video IDs here: [[https://webapps.stackexchange.com/questions/54443/format-for-id-of-youtube-video]]
+===== UPDATE (2019-02-10) =====
+Tom wrote:
+[...] After scouring the web and stack overflow it was by far the simplest solution I could find.  One thing I might suggest is working from the raw md5 output (rather than re-packing it) and remove undesirable characters.  For example, here is the function I came up with for my needs:
+<code>
+function tinymd5($str, $length) { // convert md5 to ~base(64 - count($remove)) and truncate to $length
+    // remove vowels to prevent undesirable words and similarly + / which may be problematic
+    $remove = array('a', 'e', 'i', 'o', 'u', 'A', 'E', 'I', 'O', 'U', '+', '/');
+    return str_pad(substr(str_replace($remove, '', base64_encode(md5($str, TRUE))), 0, $length), $length, '=');
+}
+</code>