what's wrong with this while loop?

["bo" <bo1st@xxxxxxxxxxx>]

Following my code is to write a 15digit random generated password into a 
file named test.txt. I was trying to keep it random generating 100 passwords 
and be written into test.txt by using a while loop, however, the result is 
strange.

Take a look at the code (most of it is from php.net) and what's wrong with 
this while loop?
besides, if I generate a large sum of passwords,say 50 million, will it be 
repetitive?
Thank you!


<?php
/*
<meta HTTP-EQUIV="REFRESH"
content="1; url=http://svr/rand.php";>
*/

$length    = 15;
$sum       = 100;
$key_chars = 
'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
$rand_max  = strlen($key_chars) - 1;
$filename  = 'test.txt';

$tot=0;
while($tot < $sum){
for ($i = 0; $i < $length; $i++){

   $rand_pos  = rand(0, $rand_max);
   $rand_key[] = $key_chars{$rand_pos};
}


$rand_pass = implode('', $rand_key);
$somecontent = "$tot $rand_pass\n";
echo $somecontent;


$filename = 'test.txt';

// Let's make sure the file exists and is writable first.
if (is_writable($filename)) {

   // In our example we're opening $filename in append mode.
   // The file pointer is at the bottom of the file hence
   // that's where $somecontent will go when we fwrite() it.
   if (!$handle = fopen($filename, 'a')) {
         echo "Cannot open file ($filename)";
         exit;
   }

   // Write $somecontent to our opened file.
   if (fwrite($handle, $somecontent) === FALSE) {
       echo "Cannot write to file ($filename)";
       exit;
   }

   echo "Success, wrote ($somecontent) to file ($filename)";

   fclose($handle);

} else {
   echo "The file $filename is not writable";
}

$tot++;
}

?> 


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