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7:

<?php
  for ($i=1; $i<=100; $i++) {
	  echo "<img src="i.png">";
	  flush();
      sleep(1);
}
?>

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7:

<?php
for ($i=1; $i<=100; $i++) {
echo "<img src="[b][u]$[/u][/b]i.png">";
flush();
sleep(1);
}
?>

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10:

<?php
$i = 0;
while($i < 10)
{
   sleep(1);
echo "<img src="i.png">";
   flush(); 
   $i++;
}
?>

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7:

<?php
ob_implicit_flush();
while($i<=100){
	  echo "<img src="$i.png">";
      $i++;
}
?>