How to find only paired phone numbers in an array?

Question

PHP

There is an array

$row_numbers=array(1234444,2223333,2233333,4443333,1234445,2234444,1234447);

, about 20k phone numbers, you need to create a new array with numbers that differ from each other by only 1 digit in the same position.
For example, the final array for the arrays above should be:

$new_array_numbers=array(1=>array(1234444,1234445,1234447),2=>array(2223333,2233333),3=>array(2234444,1234444));

1st element turned out because all the numbers in it differ only by the last digit,
2nd element turned out because all the numbers in it differ by the 3rd digit
3rd element turned out because all the numbers in it differ by the 1st digit

Answer 1

1) permutations
2) checking in an array