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random string generator (key generator)
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    This is a single function that returns a random string. Parameters allow you to specify length (min & max), use of caps/lowercase, use of numbers, and use of special characters. Example: email validation for user account creation (send the key to the email address entered and the user must supply it on the site to complete the process).

    By : mugane

    function str_makerand ($minlength, $maxlength, $useupper, $usespecial, $usenumbers)
    Author: Peter Mugane Kionga-Kamau

    Description: string str_makerand(int $minlength, int $maxlength, bool $useupper, bool $usespecial, bool $usenumbers)
    returns a randomly generated string of length between $minlength and $maxlength inclusively.

    - If $useupper is true uppercase characters will be used; if false they will be excluded.
    - If $usespecial is true special characters will be used; if false they will be excluded.
    - If $usenumbers is true numerical characters will be used; if false they will be excluded.
    - If $minlength is equal to $maxlength a string of length $maxlength will be returned.
    - Not all special characters are included since they could cause parse errors with queries.

    Modify at will.
    $charset = "abcdefghijklmnopqrstuvwxyz";
    if ($useupper) $charset .= "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    if ($usenumbers) $charset .= "0123456789";
    if ($usespecial) $charset .= "~@#$%^*()_+-={}|]["; // Note: using all special characters this reads: "~!@#$%^&*()_+`-={}|\\]?[\":;'><,./";
    if ($minlength > $maxlength) $length = mt_rand ($maxlength, $minlength);
    else $length = mt_rand ($minlength, $maxlength);
    for ($i=0; $i<$length; $i++) $key .= $charset[(mt_rand(0,(strlen($charset)-1)))];
    return $key;
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