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Special Calculations

similar_text($s1,$s2[,&$f]) returns the similarity between two strings, ie. the number of matching characters. If $f is passed, it stores the similarity in percent. levenshtein($s1,$s2[,$i1,$i2,$i3]) returns the Levenshtein distance between two strings, which is the minimal number of characters you have to replace, insert or delete to transform $s1 to $s2. $i1, $i2 and $i3 define the cost of insertion, replacement and deletion respectively. soundex($s) returns the soundex key of $s as a string that is 4 characters long. Words pronounced similarly produce the same soundex key. metaphone($s[,$i]) returns the metaphone key of $s as a string that is $i characters long. Similar to soundex(), metaphone creates the same key for similarly sounding words.

RESETRUNFULL
<!DOCTYPE html><html><head></head>
<body><?php

echo similar_text("a cat","cars",$f)." $f<br />";
echo levenshtein("a cat","cars")."<br />";
echo soundex("Kathy")."<br />";
echo soundex("kittie")."<br />";
echo metaphone("programming")."<br />";
echo metaphone("programmer")."<br />";
echo metaphone("programmer",3)."<br />";

?></body></html>