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<?php ob_start(); print_r(ob_get_status(true));
Output for 5.4.0 - 5.6.28, 7.0.0 - 7.1.0
Array ( [0] => Array ( [name] => default output handler [type] => 0 [flags] => 112 [level] => 0 [chunk_size] => 0 [buffer_size] => 16384 [buffer_used] => 0 ) )
Output for hhvm-3.10.0 - 3.12.0
Array ( [0] => Array ( [name] => default output handler [type] => 0 [level] => 0 [chunk_size] => 0 [buffer_used] => 0 ) )
Output for 4.3.0 - 5.3.29
Array ( [0] => Array ( [chunk_size] => 0 [size] => 40960 [block_size] => 10240 [type] => 1 [status] => 0 [name] => default output handler [del] => 1 ) )