I have a PHP array that looks like this
Array
(
[0] => Array
(
[events] => Array
(
[0] => Array
(
[label] => apple
[id] => 3
)
[1] => Array
(
[label] => onion
[id] => 3
)
[2] => Array
(
[label] => pear
[id] => 2
)
[3] => Array
(
[label] => orange
[id] => 1
)
[4] => Array
(
[label] => grape
[id] => 41
)
)
)
)
I am trying to get a total count of unique IDs, so in the example above I would want to get a count of 4
Do I need to loop through the array or is there a function that can do it more efficiently? Currently it is a small data set but it could grow fairly large.
您可以使用array_column
获取所有ID,并使用array_unique
删除重复项,然后对其进行计数。
count(array_unique(array_column($array[0]['events'][0], 'id')))
One way or another you'll have to loop through it. I think most efficiently would be
function getUnique($arr){
$val = array();
foreach($arr[0]["events"] as $v){
$val[$v["id"]] = true;
}
return count($val);
}
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.