php in_array specific column

Question

is there a built-in php function to find a value in a specific column of an array ?

I have an array filled with users data, and I want to check if an ID is present. My problem is that in_array check everything, so per example if the user is 20 years old and I want to check if the user where ID = 20 exists, I will get true even if there is no 20 in ID column.

I know that I can do that easily with foreach, my question is only : Has php a ready to use function to do that ?

Thanks.

No, but [this question][1] might help you. [1]: http://stackoverflow.com/questions/1019076/how-to-search-by-key-value-in-a-multidimensional-array-in-php — JohnnyFaldo, Jul 25 '13 at 08:23
Check the documentation for these types of questions: http://www.php.net/manual/en/ref.array.php . As far as your intent, you want to check `$someArray['id'] == 20` instead of checking if there is a 20 in the entire array? That approach assumes you know the column name, `id`. — BLaZuRE, Jul 25 '13 at 08:23
In fact, this is an array of array. Each row contains user's datas, with an ID column that I want to check. Php has a lots of array functions, so I'm a bit surprised that there is nothing to do that. — FLX, Jul 25 '13 at 08:29

score 7 · Accepted Answer · answered Jul 25 '13 at 08:24

No. There are a number of workarounds, but nothing that's superior to foreach:

You could use array_column or array_map to isolate the column in question and search inside the result, but this preprocesses the input and uses additional memory.
You could use array_walk to iterate over the array and search for the element, but this is in essence a worse version of foreach because it involves function calls (which are expensive in PHP) and does not stop immediately after the needle is found in the haystack.
You could use array_filter and see if the result is empty or not, but again this is a worse version of foreach (it has a mix of the drawbacks of the above methods).

Ok, thanks. It's very easy with foreach so this is not a problem. — FLX, Jul 25 '13 at 08:30

score 1 · Answer 2 · answered Jul 27 '18 at 08:44

How search value in Multi columns array?

this is my idea...

function  is_column_in_array($value,$column,$array){
        $rows = array_column( $array,$column);
        if( in_array($value,$rows)){
            return true;
        }
        return false;
    }

how to use!

$rows = array();
if( ! $this->is_column_in_array( $item->roz,'roz' ,$rows )){
               array_push($rows,
                   array(
                       'roz' => $item->roz,
                       'rozName' => $item->rozName
                   )) ;
           }

score 0 · Answer 3 · answered Dec 19 '18 at 13:18

$adult_count = 0;
$child_count = 0;
foreach($passenger_info as $key => $value) {
    if($value["room_no"] == $selected_room){
        switch ($value["passenger_type"]){
            case "adult":
                $adult_count++;
                break;
            case "children":
                $child_count++;
                break;
            default:
                break;
        }

    }

}

echo "Adults : ".$adult_count;
echo "<br>";
echo "Children : ".$child_count;

php in_array specific column

3 Answers3