在php中计算数组的特定元素

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

Answer 1

You have to count the elemets of "items".

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