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run code in 200+ php & hhvm versions
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<?php fclose(STDIN); fclose(STDOUT); fclose(STDERR); $STDIN = fopen('/dev/null', 'r'); $STDOUT = fopen('php://output', 'wb'); $STDERR = fopen('/dev/null', 'wb'); class TestFilterClass { function filter($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); } }