<?php
ob_start();
echo 'hello';
$contents = ob_get_contents();
ob_end_clean();
ob_start();
echo 'hello';
ob_end_flush();
?>
<?php
ob_start();
echo 'hello';
$contents = ob_get_contents();
ob_end_clean();
ob_start();
echo 'hello';
ob_end_flush();
?>