php man page for similar_text

SIMILAR_TEXT(3) 							 1							   SIMILAR_TEXT(3)

similar_text - Calculate the similarity between two strings

SYNOPSIS
       int similar_text (string  $first, string  $second, [float  &$percent])

DESCRIPTION
	This  calculates  the  similarity  between  two  strings as described in Programming Classics: Implementing the World's Best Algorithms by
       Oliver (ISBN 0-131-00413-1). Note that this implementation does not use a stack as in Oliver's pseudo code, but recursive calls	which  may
       or  may	not  speed  up	the whole process. Note also that the complexity of this algorithm is O(N**3) where N is the length of the longest
       string.

PARAMETERS
	      o $first
		- The first string.

	      o $second
		- The second string.

	      o $percent
		- By passing a reference as third argument, similar_text(3) will calculate the similarity in percent for you.

RETURN VALUES
	Returns the number of matching chars in both strings.

SEE ALSO
       levenshtein(3), soundex(3).

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