How to check if ajax call returns an empty array of arrays

Question

I have a php script that returns a JSON encoded array. It works correctly, but I need to check if it's empty. My problem lies in the fact that it's an array of arrays. How can I properly check for an empty array on the server side?

The PHP script (the important stuff)

$data = array();
foreach ($results = $db->getRows('SELECT * FROM users WHERE username !=?', [$username]) as $result) {
$name = $result['username'];
$lat = $result['lat'];
$lng = $result['lng'];
$distance = getDistance($user_lat, $user_lng, $lat, $lng);

if(withinRange($distance, $selected_distance, $selected_distance + 4)) {       
    //This is what's populated if data is available
    $data[] = array('name'=>$name, 'lat'=>$lat, 'lng'=>$lng); 
}

$response = array('data' => $data);
echo json_encode($response);

If data exists, it looks like this:

{"data":[{"name":"test_user2","lat":"35.932517","lng":"-89.905343"}]}

I have tried:

if(empty($response)
if(count($response) < 1)

but neither worked. Am I trying to access the wrong array? If so, how do I access the correct one to check for no data?

$response will never be empty, but $response['data'] or $data may be. — Felippe Duarte
– Felippe Duarte, Commented Sep 26, 2018 at 21:47
I figured it out, but if you wanna answer, I'll go ahead and give you the accept points. — DevOpsSauce
– DevOpsSauce, Commented Sep 26, 2018 at 21:50

Felippe Duarte · Accepted Answer · 2018-09-26 21:51:36Z

1

$response will never be empty, but $response['data'] or $data may be

$response is an array with a key named "data", so the size will always be 1.

answered Sep 26, 2018 at 21:51

Felippe Duarte

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1 Comment

DevOpsSauce Over a year ago

Thank you for pointing out that second part @Felippe. I should've known better.

shakogele · Accepted Answer · 2018-09-26 21:50:04Z

0

you need to check $data, like so:

if(sizeof($data) === 0){echo "Empty";}

answered Sep 26, 2018 at 21:50

shakogele

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1 Comment

DevOpsSauce Over a year ago

Yep. That's exactly what I was doing wrong. Accessing the wrong array. Thank you.

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