php – smallest checksum on a string – Education Career Blog

scratching my head over this.

i have 350 strings average 90 chars long, all strings are unique.
Now, i wanna generate a unique id for each string.

i tried the sum of chars in the string wich gave two doubles, the returned sum
is not unique enough. Anybody any idea how to approach this? I thought of hash(), is that the best solution?

abcdef will return the same as abcdfe

,

If you have a fixed set of strings and you will only need to look those up then find a minimal perfect hash function. http://en.wikipedia.org/wiki/Perfect_hash_function

,

Checksums and hashes will never be unique. Call the first string “1” and go from there.

Leave a Comment