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// Create a Message object from a HL7 string
$msg = new Message("MSH|^~\\&|1|\rPID|||abcd|\r"); // Either \n or \r can be used as segment endings
$pid = $msg->getSegmentByIndex(1);
echo $pid->getField(3); // prints 'abcd'
echo $msg->toString(true); // Prints entire HL7 string

// Create an empty Message object, and populate MSH and PID segments... 
$msg = new Message();
$msh = new MSH();
$msg->addSegment($msh); // Message is: "MSH|^~\&|||||20171116140058|||2017111614005840157||2.3|\n"

// Create any custom segment
$abc = new Segment('ABC');
$abc->setField(1, 'xyz');
$abc->setField(4, ['']); // Set an empty field at 4th position. 2nd and 3rd positions will be automatically set to empty
$msg->setSegment($abc, 1); // Message is now: "MSH|^~\&|||||20171116140058|||2017111614005840157||2.3|\nABC|xyz|\n"

// Create a defined segment (To know which segments are defined in this package, look into Segments/ directory)
// Advantages of defined segments over custom ones (shown above) are 1) Helpful setter methods, 2) Auto-incrementing segment index 
$pid = new PID(); // Automatically creates PID segment, and adds segment index at PID.1
$pid->setPatientName([$lastname, $firstname, $middlename, $suffix]); // Use a setter method to add patient's name at standard position (PID.5)
$pid->setField('abcd', 5); // Apart from standard setter methods, you can manually set a value at any position too

$ip = '127.0.0.1'; // An IP
$port = '12001'; // And Port where a HL7 listener is listening
$message = new Message($hl7String); // Create a Message object from your HL7 string 
$connection = new Connection($ip, $port); // Create a Socket and get ready to send message 
$response = $connection->send($message); // Send to the listener, and get a response back
echo $reponse->toString(true); // Prints ACK from the listener