I want to submit a function, can't understand how to

Hello, The PHP Team, today i was searching for a function which should generate random characters with random integer values, but i can't find a better one. So i have created a new function called rand_char(); if i pass 5 in the parameter <?php echo rand_char(5); ?> then it will generate a value like this: 5iUk4s or it can be less than 5 but never more than 5 characters. Is there is already a function like this? or I can submit it, then how i can submit my function? Thanks Best regards Hasan Twitter: @rakibtg