Get your own PHP server Result Size: 625 x 565
x
 
<!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>
Buffer level: 0.
Buffer level: 1.
Buffer level: 2.