php函数，用于计算字符串中相似字符的数量

Question

Is there a php function that counts the number of similar characters in a string?

I've looked at levenshtein, similar_text, and metaphone none seem to do this.

Example in/output would be: Hello, Heil outputs 3 (h, e, l)

Answer 1

You can use str_split to convert the strings into arrays, then array_unique and array_intersect to get the common letters.

For example:

$str1 = "hello";
$str2 = "hola";

$chars1 = array_unique(str_split($str1));
$chars2 = array_unique(str_split($str2));

echo "Common characters: ".count(array_intersect($chars1, $chars2));