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run code in 150+ php & hhvm versions
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<?php fclose(STDOUT); $STDOUT = fopen('php://output', 'wt'); class TestFilterClass { function filter($in, $out) { while (true) { $bucket = stream_bucket_make_writeable($in); if (is_object($bucket)) { $bucket->data = sprintf('[%s] %s', __METHOD__, $bucket->data); stream_bucket_append($out, $bucket); } break; } return PSFS_PASS_ON; } } if (stream_filter_register('TestFilter', 'TestFilterClass')) { $handle = stream_filter_append($STDOUT, 'TestFilter'); if (is_resource($handle)) { fwrite($STDOUT, 'hello world' . PHP_EOL); // ok echo 'hello world' . PHP_EOL; // nope stream_filter_remove($handle); } }
Output for 5.2.3 - 5.2.6, 5.4.28 - 5.4.45, 5.5.12 - 7.1.0
Output for 5.2.7 - 5.4.27, 5.5.0 - 5.5.11

Process exited with code 139.
Output for 5.1.0 - 5.2.2
Notice: Use of undefined constant STDOUT - assumed 'STDOUT' in /in/oks59 on line 3 Warning: fclose(): supplied argument is not a valid stream resource in /in/oks59 on line 3 [TestFilterClass::filter] hello world hello world
Output for 5.0.0 - 5.0.5
Notice: Use of undefined constant STDOUT - assumed 'STDOUT' in /in/oks59 on line 3 Warning: fclose(): supplied argument is not a valid stream resource in /in/oks59 on line 3
Output for 4.4.5 - 4.4.9
Notice: Use of undefined constant STDOUT - assumed 'STDOUT' in /in/oks59 on line 3 Warning: fclose(): supplied argument is not a valid stream resource in /in/oks59 on line 3 Fatal error: Call to undefined function: stream_filter_register() in /in/oks59 on line 26
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Notice: Use of undefined constant STDOUT - assumed 'STDOUT' in /in/oks59 on line 3 Warning: fclose(): supplied argument is not a valid stream resource in /in/oks59 on line 3 Fatal error: Call to undefined function: stream_filter_register() in /in/oks59 on line 26
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Notice: Use of undefined constant STDOUT - assumed 'STDOUT' in /in/oks59 on line 3 Warning: fclose(): supplied argument is not a valid stream resource in /in/oks59 on line 3 Fatal error: Call to undefined function: stream_filter_register() in /in/oks59 on line 26