PHP : Count number of JSON items/objects
Recently I need to paginate the search result returned by ElasticSearch. To paginate the result with standard CodeIgniter paginate helper.... one of the requirements is to know in advance the total_rows
or the total number of rows to display.
Since ElasticSearch is not really a SQL database and my knowledge of ElasticSearch is at minimum just to get it running. I decided to use PHP's count
function to get the total_rows
... by counting the items/objects inside JSON array.
To achieve this, first we need to encapsulate the result returned from ElasticSearch into JSON format with json_encode
$json_data = json_encode($this->elasticsearch->advancedquery("type", $searchquery));
next, decode it back
$decoded = json_decode($json_data);
and get the total_rows
for configuring the pagination with
$config['total_rows'] = count($decoded->hits->hits);
NOTE : To find the number of returned result or hits
or other result variables that you want to capture....you can do this to see all the result output.
echo "<pre>";
print_r($json_data);
echo "</pre>";
Hope this tutorial can help you to count the number of items or objects inside JSON array.
By Adam Ng
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