Neo4j merge's not saving data

I have the following code using PHP & GraphAware:

$stack = $client->stack();
$stack->push('  MATCH (student:Student{id:123})
        MATCH (spring:Term{name:"Spring2017"})
        MATCH (class:Class{name:"Cypher101"})
        MERGE (student)-[:ENROLLED_IN]->(class)-[:FOR_TERM]->(spring)');
$results = $client->runStack($stack);

$res = $client->run('MATCH (n) RETURN count(n)');
print_r($res->records());

I have copied the example code found here: https://neo4j.com/developer/kb/understanding-how-merge-works/ and for some reason the print_r() returns the following:

Array
(
    [0] => GraphAware\Bolt\Record\RecordView Object
        (
            [keys:protected] => Array
                (
                    [0] => count(n)
                )

            [values:protected] => Array
                (
                    [0] => 0
                )

            [keyToIndexMap:GraphAware\Bolt\Record\RecordView:private] => Array
                (
                    [count(n)] => 0
                )

        )

)

If I run a CREATE command the query works fine but for some reason the code above won't. Can someone advise me what I'm doing wrong?

Your query seems correct.

Check if these nodes exist in the Neo4j Database.

• If these are not present in the database first create these nodes and then run the query.
• You can also replace MATCH with MERGE, in that case, you don't
  have to create these nodes separately.

NOTE: Multiple MERGE in a single query is not recommended, so try to use the first solution (creating the nodes separately).