Question

I’ve got string like "X los(2) - XYZ tres"

How I can find all upper case letters and words and replace them with random numbers?

From first string I should get "2 los(2) - 6 tres" or "9 los(2) - 5 tres"

I mean that one UPPER word should becomes one single digit.

Answer 1

This is how I’d do it.

Use a regex to find groups of uppercase characters and replace them with a random digit between 0 and 9 (all single digits in a decimal system).

$str = preg_replace_callback('/[A-Z]+/', function() {
     return rand(0, 9);
}, $str);

CodePad.