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Generate a random string
function random_str ($len, $lower = 1, $hex = 1)
This function will generate a random string.
$len = length of string.
If $lower = true, use lower case, default true.
If $hex = true, use only characters 0-9 & a-f, mimicking hexadecimal numbers; if false, use alfanumeric (A-Z & 0-9) characters.
Example 1
<?php
require './includes/user_init.php';
echo random_str (16);
?>
This will genarate a string with 16 characters, mimicking a hexadecimal value.
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