Calculate the similarity between two strings
similar_text ( string $first , string $second [, float &$percent ] ) : int
The first string.
The second string.
Note: Swapping the first and second may yield a different result.
By passing a reference as third argument, similar_text() will calculate the similarity in percent, by dividing the result of similar_text() by the average of the lengths of the given strings times 100.
Returns the number of matching chars in both strings. The number of matching characters is calculated by finding the longest first common substring, and then doing this for the prefixes and the suffixes, recursively. The lengths of all found common substrings are added.
<? $first = 'same'; $second = 'different'; $return = similar_text($first, $second); echo $return; ?>
<? $first = 'same'; $second = 'different'; $return = similar_text($first, $second, $percent); echo $percent; ?>
<? $first = 'sometest'; $second = 'sotestsome'; $return1 = similar_text($first, $second, $percent1); $return2 = similar_text($second, $first, $percent2); echo "$return1 $percent1\n"; echo "$return2 $percent2"; ?>
4 44.444444444444 6 66.666666666667