Search with in_array_r returns wrong result

Question

I am trying to find value in multidimensional array using recursive in_array function, but I always get not found. This is the structure of array $v :

Array
(
    [0] => Array
        (
            [EV000005] => Array
                (
                    [0] => Array
                        (
                            [0] => Array
                                (
                                    [0] => EN
                                    [1] => Thread holding
                                )

                            [1] => Array
                                (
                                    [0] => nl-NL
                                    [1] => Schroefdraadhouder
                                )
                        )
                )
        )

This is function:

public function in_array_r($needle, $haystack, $strict = false) {
            foreach ($haystack as $item) {
                if (($strict ? $item === $needle : $item == $needle) || (is_array($item) && $this->in_array_r($needle, $item, $strict))) {
                    return true;
                }
            }
            return false;
        }

And this is how I call function which echoes to me not found instead of found:

echo $this->in_array_r("EV000005", $v) ? 'found' : 'not found';

I also tried to use $strict = true but same result. Why is the search for EV000005 unsuccessful in this case?

Would this topic help? https://stackoverflow.com/questions/1019076/how-to-search-by-key-value-in-a-multidimensional-array-in-php — ino, Dec 29 '17 at 07:30
try this ["EV000005"] => Array(...) instead of [EV000005] => Array(...) — maddy23285, Dec 29 '17 at 07:32
You use function that find value in multidimentional array, but you need array_key_exists extended for such arrays such as https://hotexamples.com/examples/-/-/array_key_exists_recursive/php-array_key_exists_recursive-function-examples.html — splash58, Dec 29 '17 at 07:46
There is also this... https://stackoverflow.com/questions/20592046/find-key-in-nested-associative-array Which is another of a few options. — TimBrownlaw, Dec 29 '17 at 08:10

Rahul · Accepted Answer · 2017-12-29T08:28:11.223

Reference from link.

You are searching recursively for value, but in example you are trying to search it by key.

You can use this function to achieve this,

function array_key_exists_custom($needle, $haystack)
{
    $result = array_key_exists($needle, $haystack);
    if ($result) {
        return $result;
    }

    foreach ($haystack as $v) {
        if (is_array($v)) {
            $result = array_key_exists_custom($needle, $v);
        }
        if ($result) {
            return $result;
        }

    }
    return $result;
}

Here is working demo.

Here is object oriented working demo as per requirement.

Here is your code :

<?php
//Enter your code here, enjoy!
class A
{

    public function array_key_exists_custom($needle, $haystack)
    {
        $result = array_key_exists($needle, $haystack);
        if ($result) {
            return $result;
        }

        foreach ($haystack as $v) {
            if (is_array($v)) {
                $result = $this->array_key_exists_custom($needle, $v);
            }
            if ($result) {
                return $result;
            }

        }
        return $result;
    }
    public function getData()
    {
        $arr = array
            (
            "0" => array
            (
                "EV000005" => array
                (
                    "0" => array
                    (
                        "0" => array
                        (
                            "0" => "EN",
                            "1" => "Thread holding",
                        ),

                        "1" => array
                        (
                            "0" => "nl-NL",
                            "1" => "Schroefdraadhouder",
                        ),
                    ),
                ),
            ),
        );
        $temp = $this->array_key_exists_custom("EV000005", $arr);
        echo ($temp ? "found" : "not found");
    }
}
$obj = new A;

$obj->getData();
?>

I believe that it solution for my case, but I have following problem: Uncaught Error: Call to undefined function array_key_exists_custom(). I am using function in this way: $temp = $this->array_key_exists_custom("EV000005",$v); . Function is defined and called inside class classification and this is why I am using $this. I don't see reason for this error message. — punky, Dec 29 '17 at 08:21
Could you help me little more? I need to check does EV000005 exist, and if it exist I want to collect his "Thread holding" value from structure, how should I do this? — punky, Dec 29 '17 at 08:53
For that you need to normalise your array or tell me what will be the conditions to fetch that value.. — Rahul, Dec 29 '17 at 09:15
Take a look on this : https://stackoverflow.com/questions/48020478/php-search-for-key-in-multidimenstional-array-and-get-its-values-deeper-from-t — punky, Dec 29 '17 at 09:44

score 0 · Answer 2 · answered Dec 29 '17 at 07:40

0

Try this, your array should be:

Array
(
[0] => Array
    (
    ["EV000005"] => Array
        (
        [0] => Array
        (
            [0] => Array
                (
                [0] => "EN"
                [1] => "Thread holding"
                )

            [1] => Array
                (
                [0] => "nl-NL"
                [1] => "Schroefdraadhouder"
                )
        )
        )
    )
)

answered Dec 29 '17 at 07:40

maddy23285

738
6
16

Editing array is not a option in this case. I need to work with array as it is. – punky Dec 29 '17 at 07:45
try this: echo $this->in_array_r($v[0][0], $v) ? 'found' : 'not found'; – maddy23285 Dec 29 '17 at 07:54
The sample array that shows missing quotes on the strings is just a result of the print_r() function. So it's a non issue. – TimBrownlaw Dec 29 '17 at 07:57
Just discovered var_export() using pre tags gives a different output. At least it quotes the stings. That is, once you have constructed the above array correctly. – TimBrownlaw Dec 29 '17 at 08:03

score 0 · Answer 3 · answered Dec 29 '17 at 07:53

0

in_array_r searches for values, but you are looking vor a key. try this gist

answered Dec 29 '17 at 07:53

Thomas L.

104
8

Search with in_array_r returns wrong result

3 Answers3