<!DOCTYPE html>
<html>
<body>
<?php
$buffer_count = ob_get_level();
echo "Buffer level: $buffer_count.<br>";
// Add an output buffer
ob_start();
$buffer_count = ob_get_level();
echo "Buffer level: $buffer_count.<br>";
// Add another output buffer
ob_start();
$buffer_count = ob_get_level();
echo "Buffer level: $buffer_count.<br>";
// Close all buffers
ob_end_flush();
ob_end_flush();
?>
</body>
</html>
