executing multiple merge neo4j query via php - neo4j

Question

I was using the neo4j query as below till now but I am wondering if it's making neo4j out of memory as I am not committing anywhere(I guess its auto-commit) .But the query works fine only worried if neo4j will shutdown or slow down due to my query. I really appreciate any help.
sample.php
<?php
if (!empty($array)) {
if( get_magic_quotes_gpc() ) {
$array = stripslashes( $array );
}
$newstr = json_decode( preg_replace('/[\x00-\x1F\x80-\xFF]/', '', $array), true );
if(!empty($newstr)){
$j=0;
foreach($newstr as $item) { //foreach element in $arr
$category_id = $item['category_id']; //etc
$category_name = $item['category_name'];
$category = $item['category'];
$data2 .=' MERGE (u'.$j.':Category {name:"'.$category_name.'",id:"'.$category_id.'",category:"'.$category
.'"}) ';
$j=$j+1;
}
$data2 = array("query" =>$data2);
$data_string = json_encode($data2);
$ch = curl_init('http://localhost:7474/db/data/cypher');
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
curl_setopt($ch, CURLOPT_POSTFIELDS, $data_string);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, array(
'Content-Type: application/json',
'Content-Length: ' . strlen($data_string))
);
$result = curl_exec($ch);
}else{
echo "null";
}
}
?>

Answer 1

You are using the Legacy Cypher HTTP Endpoint, which automatically commits at the end of a successful query. So, there is no need to worry about losing your data.
However, the legacy endpoint is now deprecated, so you should consider changing over to the Transactional endpoint.
Also, as a suggestion, you can change this snippet:
' MERGE (u'.$j.':Category {name:"'
to:
' MERGE (:Category {name:"'
Your query never uses the uxxx identifiers, so there is no need to define them in the first place.