​x
 
<!DOCTYPE html>
<html>
<body>
​
<?php
$buffer_count = ob_get_level();
echo "缓冲区级别: $buffer_count.<br>";
​
// 添加一个输出缓冲区
ob_start();
$buffer_count = ob_get_level();
echo "缓冲区级别: $buffer_count.<br>";
​
// 添加另一个输出缓冲区
ob_start();
$buffer_count = ob_get_level();
echo "缓冲区级别: $buffer_count.<br>";
​
// 关闭所有缓冲区
ob_end_flush();
ob_end_flush();
?> 
​
</body>
</html>