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PHP Fatal error: Uncaught Error: Call to undefined method Net_HL7_Connection::close()

in composer.json file:

"require": {
        "pear/pear_exception": "*",
        "pear/net_socket": "dev-trunk" //<-- instead of *
},

PHP Fatal error: Uncaught InvalidArgumentException: Name should be 3 characters, uppercase in Net/HL7/Segment.php:58

Using Net_HL7_Message($string), if a segment contains a field that has empty components, those empty components are removed when the string is parsed. For example:

$msgstr = 'MSH|^~\&|SOME_SOURCE||||20180723115125||DFT^P03|2018072311512590201|P|2.2||||NE|' . "\n" .
'PV1|1|POFFV|723327^^^SLM^^^^^^^DEPID|3|||16367^LAST^FIRST^^^^^^EPROV^^^^PROVID|||||||2|||||300023352295|SELF||||||||||||||||||||||||20180123152601||||||100000000375|';

$msg = new Net_HL7_Message($msgstr);
error_log ($msg->toString(true));

results in:

MSH|^~\&|SOME_SOURCE||||20180723115125||DFT^P03|2018072311512590201|P|2.2||||NE|
PV1|1|POFFV|723327^SLM^DEPID|3|||16367^LAST^FIRST^EPROV^PROVID|||||||2|||||300023352295|SELF||||||||||||||||||||||||20180123152601||||||100000000375|

The problem seems to stem from line 165 in Message.php:

$comps = preg_split("/\\" . $this->_componentSeparator ."/", $fields[$j], -1, PREG_SPLIT_NO_EMPTY);

The PREG_SPLIT_NO_EMPTY flag should not be present, I believe.

When sending a message, the response takes about half a minute.

I tracked down the cause:
In the Net_HL7_Connection class, the send function iteratively reads 256 byte from the socket file pointer at once, until the message suffix is detected. But the last read operation takes very long.
I think it is, because the last buffer may not be filled completely up to 256 bytes.