How does similar_text work?

Question

I just found the similar_text function and was playing around with it, but the percentage output always suprises me. See the examples below.

I tried to find informa

Answer 1

first String = aaaaaaaaaa = 10 letters
second String = aaaaa = 5 letters

first five letters are similar
a+a
a+a
a+a
a+a
a+a
a
a
a
a
a


(  * 200 ) / ( + )

( 5 * 200 ) / (10 + 5);
= 66.6666666667