<?php
header( 'Content-type: text/html; charset=utf-8' );
$user = 'admin';
$pass = 'admin';
if($user != (isset($_POST['user']) ? $_POST['user'] : '') || $pass != (isset($_POST['pass']) ? $_POST['pass'] : '')) :
  echo '<form method="POST" style="width: 200px; margin: auto;">';
  echo '<table>';
  echo '<tr><td>USER:</td><td><input type="text" name="user"></input></td></tr>';
  echo '<tr><td>PASS:</td><td><input type="password" name="pass"></input></td></tr>';
  echo '<tr><td colspan=2 style="text-align: center;"><input type="submit" name="submit" value="Go" style="width: 180px;"></input></td></tr>';
  echo '</table>';
  echo '</form>';
  exit;
endif;
//---------------------------------------------------------------
// DO NOT REMOVE THE CODE ABOVE TO ENSURE BADDIES DON'T USE YOUR
// SCRIPT!

// You can use:
//    flush();
//    ob_flush();
// to flush the output buffering at anytime
//---------------------------------------------------------------
?>

<?php
echo 'Begin ...<br />';
for( $i = 0 ; $i < 10 ; $i++ ) {
    echo $i . '<br />';
    flush();
    ob_flush();
    sleep(1);
}
echo 'End ...<br />';
?>