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? stackoverflow.com/questions/1019076/… — ino
– ino, Commented Dec 29, 2017 at 7:30
try this ["EV000005"] => Array(...) instead of [EV000005] => Array(...) — maddy23285
– maddy23285, Commented Dec 29, 2017 at 7:32
You use function that find value in multidimentional array, but you need array_key_exists extended for such arrays such as hotexamples.com/examples/-/-/array_key_exists_recursive/… — splash58
– splash58, Commented Dec 29, 2017 at 7:46
There is also this... stackoverflow.com/questions/20592046/… Which is another of a few options. — TimBrownlaw
– TimBrownlaw, Commented Dec 29, 2017 at 8:10

Rahul · Accepted Answer · 2017-12-29 08:28:11Z

2

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();
?>

edited Dec 29, 2017 at 8:28

answered Dec 29, 2017 at 7:54

Rahul

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4 Comments

punky Over a year ago

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 Over a year ago

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?

Rahul Over a year ago

For that you need to normalise your array or tell me what will be the conditions to fetch that value..

punky Over a year ago

Take a look on this : stackoverflow.com/questions/48020478/…

maddy23285 · Accepted Answer · 2017-12-29 07:40:30Z

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, 2017 at 7:40

maddy23285

7867 silver badges17 bronze badges

4 Comments

punky Over a year ago

Editing array is not a option in this case. I need to work with array as it is.

maddy23285 Over a year ago

try this: echo $this->in_array_r($v[0][0], $v) ? 'found' : 'not found';

TimBrownlaw Over a year ago

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 Over a year ago

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.

Thomas L. · Accepted Answer · 2017-12-29 07:53:10Z

0

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

answered Dec 29, 2017 at 7:53

Thomas L.

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