Random string generator

gistfile1.php

<?php

$use_upper = true;
$use_lower = true;
$use_digits = true;
$use_symbols = true;

$string_length = 24;

$letters = 'abcdefghijklmnopqrstuvwxyz';
$digits = '1234567890';
$symbols = '~`!@#$%^&*()_-+={[}]|\\;:"\'<,>.?/';

$rand_string = '';
if($use_upper) {
        $rand_string .= strtoupper($letters);
}

if($use_lower) {
        $rand_string .= $letters;
}

if($use_digits) {
        $rand_string .= $digits;
}

if($use_symbols) {
        $rand_string .= $symbols;
}

$rand_string_length = strlen($rand_string)-1;

$output = '';

for($i=0;$i<$string_length;$i++) {
        $index = rand(0,$rand_string_length);
        $output .= $rand_string[$index];

}


echo $output;
echo "\n\n";

?>

hacked up real quick. does the job