[ACCEPTED]-how could I make a search match for similar words-search
The Levenshtein Distance is what you are looking for.
For any 7 two strings, it calculates the minimum number 6 of insertions, mutations and deletions that 5 need to occur to changes one string to the 4 other.
If the distance is low then the two 3 words are similar.
You could also use the 2 Soundex algorithm to determine if two words sound 1 similar.
Well, there is the mother of all "related 12 word lists", called WordNet: http://wordnet.princeton.edu/
It's available 11 free of charge subject to a fairly generous 10 license. There is a PHP interface in the 9 "related projects" section.
The 8 advantage of this over using a word similarity 7 algorithm is that it even knows dissimilar 6 synonyms of words such as "paint" and 5 "colour". The downside is that 4 you either have to know the right synsets 3 (after all, one word can mean different 2 things) or you can get a pretty wild list 1 of synonyms.
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