How can I generate a random string in PHP? Example code: - Biz Tech

How can I generate a random string in PHP? Example code:

Listen 
$characters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
$length = 10;
$random_string = "";

for ($i = 0; $i < $length; $i++) {
    $random_string .= $characters[rand(0, strlen($characters) - 1)];
}

echo $random_string;

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