How to generate a small set of alphanumeric characters in PHP?

Question

How to generate a small set of PHP characters like this M7kL8a8z7q?

I want to upload several documents and I want to rename the files in PHP as the image button does here in Stack Overflow. If I mix md5, with the date and others gets huge.

^{You don’t have to follow this order of characters, you just have to be random, not repeat and have 10 characters.}

Answer 1

A simple password generator, you can change the password size by changing the variable length, and possible characters by changing the variable characters. Source

function generateRandomString($length = 10) {
    $characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
    $charactersLength = strlen($characters);
    $randomString = '';
    for ($i = 0; $i < $length; $i++) {
        $randomString .= $characters[rand(0, $charactersLength - 1)];
    }
    return $randomString;
}