php get last 6 characters in string code example

Example 1: take last four digits php

$newstring = substr($dynamicstring, -7);

Example 2: take 10 character from string using php

$return_string = substr("Hi i am returning first 10 characters.", 0, 10);
Output:
"Hi i am re"

Example 3: php nth characters from end of string

$rest = substr("abcdef", -3, 1); // returns 'd'