Get sub array from sub array value in PHP

Question

I have a data structure like that:

Array(
    [494] => Array(
        [meta_key] => course_494_access_from
        [expires_in] => 95
    ),
    [498] => Array(
        [meta_key] => course_498_access_from
        [expires_in] => 122
    ),
    [502] => Array(
        [meta_key] => course_502_access_from
        [expires_in] => 30
    ),
    [506] => Array(
        [meta_key] => course_506_access_from
        [expires_in] => 365
    )
)

and I like to ask, if there is a way to get the expires_in value by searching the course_502_access_from

So, in example, I like to know if there is a way to perform an array search in the given structure, by usign the term course_502_access_from and then get the value 30 that corresponds to sub array key expires_in.

hindmost · Accepted Answer · 2014-03-04 14:26:36Z

2

In general case when there are multiple occurences of searching string ('course_502_access_from') you may use array_filter with array_map. Somehow like this:

$result = array_map(
    function ($v) {
        return $v['expires_in'];
    },
    array_filter($array, function ($v) {
        return $v['meta_key'] == 'course_502_access_from';
    }
);

print_r($result);

answered Mar 4, 2014 at 14:26

hindmost

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Comments

Community · Accepted Answer · 2023-11-17 19:59:20Z

2

I think you can just loop in array and use in_array() function to find your match value

foreach($array as $key => $data)
{
    if(in_array("course_502_access_from",$data))
    {
        echo $array[$key]['expires_in'];
        break;
    }
}

Working sample here

edited Nov 17, 2023 at 19:59

CommunityBot

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answered Mar 4, 2014 at 14:21

Fabio

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1 Comment

Kalzem Over a year ago

Adding a break; in the if would avoid useless loops as it appears that there is no twice the same course_502_access_from in the array

Realitätsverlust · Accepted Answer · 2014-03-04 14:21:04Z

1

If the structure never changes and stays that way, its pretty easy, yes:

foreach($your_array as $a) {
    if($a["meta_key"] === "course_502_access_from") {
        return $a["expires_in"];
    }
}

If it does and you get multiple layers ... well, then things start to become complicated. You could create a function and use it recursive ... but that would require more than just these 5 lines of code.

answered Mar 4, 2014 at 14:21

Realitätsverlust

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