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The following PHP script can be used to generate a random password. You can easily change the length of the generated string as well as the characters it can consist of.

<?php
// length of generated password
$n = 8;
// characters that can be used in password
$characters = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890';
// generate and return the random password
function randPass($n, $chars)
{
  srand((double)microtime()*1000000);
  $m = strlen($chars);
  while($n--)
  {
    $randPassword .= substr($chars,rand()%$m,1);
  }
  return $randPassword;
}
?>