Count specific elements of an array in php

Question

I would like to count specific elements ('host_name') of an array.

My function is decoding a json file and returning the array.

file.json

{
    "href": "https://webservice:8080",
    "items": [
        {
            "Hosts": {
                "cluster_name": "cluster1",
                "host_name": "server1"
            },
            "href": "https://server1:8080"
        },
        {
            "Hosts": {
                "cluster_name": "cluster1",
                "host_name": "server2"
            },
            "href": "https://server2:8080"
        },
        {
            "Hosts": {
                "cluster_name": "cluster1",
                "host_name": "server3"
            },
            "href": "https://server3:8080"
        }
    ]
}

My php page to decode the json file :

functions.php

function test($clusterName)
{
$content = file_get_contents($clusterName.".json");
                $content = utf8_encode($content);
                $result = json_decode($content, true);

                return  $result;
}

And my page where i'd like to display the number of host names :

page.php

$result = test("mycluster");
echo "<p>".count($result['Hosts']['host_name'])."</p>";

But I have an undefined index for 'Hosts' when I do this. I tried some things, I can tell that the array is well there (print_r shows it), but I really can't count elements of it.

Thanks

What did you try so far? What is the problem to count?

Gino Pane
– Gino Pane

2017-07-28 17:55:24 +00:00
Commented Jul 28, 2017 at 17:55 — Gino Pane
– Gino Pane, Commented Jul 28, 2017 at 17:55

nanocv · Accepted Answer · 2017-07-28 17:57:21Z

1

You have to count the elemets of "items".

echo "<p>".count($result['items'])."</p>";

answered Jul 28, 2017 at 17:57

nanocv

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1 Comment

tonio94 Over a year ago

Same answer : Undefined index: items

RichGoldMD · Accepted Answer · 2017-07-28 17:58:52Z

1

You could use

$c = count($result['items']) ;

answered Jul 28, 2017 at 17:58

RichGoldMD

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2 Comments

RichGoldMD Over a year ago

Can we see a print_r of $result as returned by test()?

tonio94 Over a year ago

Ok my bad, it works now. I changed the code in the meantime and I was returning $result['items'] in my function instead of $result. So it's good now, thanks!

Yolo · Accepted Answer · 2017-07-28 18:05:09Z

1

You can loop through the items and hosts and check if host_name is present.

$result = test("mycluster");

$count = 0;
foreach($result['items'] as $item) {
    $count += isset($item['Hosts']) && isset($item['Hosts']['host_name']) ? 1 : 0;
}
print_r($count); // will print 3

answered Jul 28, 2017 at 18:05

Yolo

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