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<!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.