How to count items in an array that's in an array?

问题

How do you count items in an array that's part of an array? I'm using Advance Custom Fields plugin in WordPress and my array print_r(get_field('irl_today_entry')) output looks like this:

Array
(
[0] => Array
    (
        [acf_fc_layout] => irl_today_website_entry
        [irl_today_website] => Array
            (
                [0] => Array
                    ( data removed)

                [1] => Array
                    ( data removed )
            )
    )
[1] => Array
    (
        [acf_fc_layout] => irl_today_social_entry
        [irl_today_social] => Array
            (
                [0] => Array
                    ( data remove )
                [1] => Array
                    ( data remove)
            )
    )
)

How do you only count items in [irl_today_social]? I've tried a lot of options that do not work.

回答1:

If you have multiple entries with irl_today_social you might also use array_map and array_column

$res = array_map(function($x) {
    return count($x);
}, array_column($arrays, "irl_today_social"));

print_r($res);

Output

Array
(
    [0] => 2
)

See a php demo

回答2:

You can use array_reduce,

array_reduce(get_field('irl_today_entry'),function($a,$b){
    return count($a["irl_today_website"]) + count($b["irl_today_website"]);
});

回答3:

Loop through your array, get the count of your desired index, and add that to a counter.

 $count = 0;
 foreach(get_field('irl_today_entry') as $entry){
   $count = $count + count(entry['irl_today_social']);
 }

回答4:

Simply you can use "Count" Function

Here is the Solution:

Step 1: First get your array items of ['irl_today_entry'].
Step 2 Then Count your ['irl_today_social'] items.

Example:

foreach(get_field('irl_today_entry') as $entry){
   $socialData = count(entry['irl_today_social']);
}

Thanks

回答5:

according to my understaing just simply try this

echo count($your_array[1]['irl_today_social']);

来源：https://stackoverflow.com/questions/58656225/how-to-count-items-in-an-array-thats-in-an-array

标签

php

arrays

wordpress

advanced-custom-fields