PHP solr atomic update - php

Question

I'm new in solr and I've been using this thread to do a atomic update
How do I update a document in Solr PHP?
Basically im doing an mysql query then update a document on solr
Question: How to do an atomic update where a specific field matches a field should be matched inside an if statement like this:
if(solr(username.field) == 'john'))
{
//execute atomic update
}
so far my code is messy like these:
$query = "SELECT * from User";
$options = array
(
'hostname' => SOLR_SERVER_HOSTNAME,
'login' => SOLR_SERVER_USERNAME,
'password' => SOLR_SERVER_PASSWORD,
'port' => SOLR_SERVER_PORT,
'path' => SOLR_SERVER_PATH,
);
$result = $mysqli->query($query);
if($result->num_rows > 0)
{
while($row=mysqli_fetch_assoc($result))
{
$querySearch = '+username:*'; //query all user that is on solr
$query = new SolrQuery();
$query->setQuery($querySearch);
$query->setStart(0);
$query->setRows(10000);
$client = new SolrClient($options);
$query_response = $client->query($query);
$query_response->setParseMode(SolrQueryResponse::PARSE_SOLR_DOC);
$response = $query_response->getResponse();
$doc = new SolrInputDocument();
$counter = $response->response->numFound;
for($x = 0; $x < $counter; $x++)
{
$doc = $response->response->docs[$x]->getInputDocument(); //this gets the old value (refer to thread)
$docs = $query_response->getResponse()->response->docs[$x]->username->values; //how I get the value of users
$second_doc = new SolrInputDocument();
if($docs == get_product($row['USERNAME']))
{
$second_doc->addField('points', $row['POINTS']); //this suppose to update my solr document with those username found
}
else
{
$second_doc->addField('points', "0");
}
$second_doc->merge($doc);
$updateResponse = $client->addDocument($second_doc);
$client->commit();
}
}

Answer 1

It should have been
if(!empty($response->response->docs[$x]->username->values[$x]) == get_product($row['USERNAME']))
{
$doc = $response->response->docs[$x]->getInputDocument();
$second_doc->addField('point', $row['POINT']);
}
else
{
//do other update here
}
//$response->response->docs[$x]->username->values[$x] => get the usernames in the document