Recursive Array_Search

Recursive array_search

You can change your recursive function like this, which should give you the solution:

function recursive_array_search($needle, $haystack, $currentKey = '') {
    foreach($haystack as $key=>$value) {
        if (is_array($value)) {
            $nextKey = recursive_array_search($needle,$value, $currentKey . '[' . $key . ']');
            if ($nextKey) {
                return $nextKey;
            }
        }
        else if($value==$needle) {
            return is_numeric($key) ? $currentKey . '[' .$key . ']' : $currentKey . '["' .$key . '"]';
        }
    }
    return false;
}

This will result in

[1][1][0]["CategoryID"]

Since CategoryID is also a key in your multidimensional array.

If you don't want this, you can adapt the function to

function recursive_array_search($needle, $haystack, $currentKey = '') {
    foreach($haystack as $key=>$value) {
        if (is_array($value)) {
            $nextKey = recursive_array_search($needle,$value, $currentKey . '[' . $key . ']');
            if ($nextKey) {
                return $nextKey;
            }
        }
        else if($value==$needle) {
            return is_numeric($key) ? $currentKey . '[' .$key . ']' : $currentKey;
        }
    }
    return false;
}

Recursive array_search?

Simple foreach loop would do,

$result = [];
foreach ($arr as $key => $value) {
    $result[$value][] = $key; // grouping array as per value as key
}
print_r($result);

Demo

Output:-

Array
(
    [dummy2] => Array
        (
            [0] => https://i.imgur.com/vyGHgZN.jpg
        )

    [dummy] => Array
        (
            [0] => https://i.imgur.com/UYK4Agz.png
            [1] => https://i.imgur.com/xEXdKYn.jpg
        )

)

PHP recursive array_search

You do not need a recursion here, simply add an additional loop in the get_range() function. The following example is based on your code and is a possible solution to your problem:

<?php
$array = [8,2,3,7,4,6,5,1,9];
$subsets =  array (
  array(6,3,7),
  array(4,2,9),
  array(3,5,6),
);

function get_range($array, $subsets)
{
    $result = array();
    foreach ($subsets as $subset) {
        $min = sizeof($array);
        $max = 0;
        foreach($subset as $value) {
            $occurrence = array_search($value, $array);
            if( $occurrence < $min ) {
                $min = $occurrence;
            }
            if( $occurrence >  $max ) {
                $max = $occurrence;
            }
        }
        $result[] = [$min, $max];
    }
    
    return $result;
}

$range = get_range($array, $subsets);
echo print_r($range, true);
?>

Result:

Array ( 
    [0] => Array ( [0] => 2 [1] => 5 ) 
    [1] => Array ( [0] => 1 [1] => 8 ) 
    [2] => Array ( [0] => 2 [1] => 6 ) 
)

array_search not working in multi dimensional array as expected

array_search function is not recursive, so you have to iterate over the array and search in the subarrays:

$foundInParent = false;
foreach($array as $parentKey => $subArray) {
  if (array_search(5.97, $subArray)) {
    $foundInParent = $parentKey;
    break;
  }
}

echo $foundInParent;

Just wrap it in a function..

array_search recursive function php

Ok here's what you should change it to:

$ex = [12,18,15];

for($i=0; $i<20;$i++) {
    print randWithout(10,20,$ex) . PHP_EOL;
}

function randWithout($from, $to, array $exceptions) {
    do {
        $number = mt_rand($from, $to);
    } while(in_array($number,$exceptions));

    return $number;
}

Just tested it and it works.

Search PHP array for value and get parent key

You can just use array_search and array_column for this:

$power = 'SuperStrength';
$key = array_search($power, array_column($our_array[0]["powers"], 'power'));
echo "$key\n";
$power = 'Invisibility';
$key = array_search($power, array_column($our_array[0]["powers"], 'power'));
echo "$key\n";

Output:

0
1

Note that array_search returns false (which can be equivalent to 0) if it doesn't find a value, so when checking the result you should use !== false to test for success. For example:

$power = 'Flying';
$key = array_search($power, array_column($our_array[0]["powers"], 'power'));
if ($key !== false) echo "$key\n";
else echo "power $power not found!\n";

Output:

power Flying not found!

Demo on 3v4l.org

Find specific value in multidimensional array

You can use in_array with splat operator,

Below is for multidimensional arrays

$temp = array_merge(...$array_2);
var_dump(in_array(2, $temp));
$temp = array_merge(...$array_3);
var_dump(in_array(2, $temp));

for 1D arrays,

you can directly check in_array($value_to_search, $array_1);

I am exposing array to their value level so they flatten up.

Now I just checked with in_array whether it exists in an array or not.

Demo.

using array_search for multi dimensional array

function find_car_with_position($cars, $position) {
    foreach($cars as $index => $car) {
        if($car['Position'] == $position) return $index;
    }
    return FALSE;
}

array_search Recursive in javascript

This might give you a start. Not thoroughly tested or highly optimized, and assumes use of jQuery (shouldn't be a big problem to replace the jQuery utilty functions with other implementations).

function searchArrayRecursive(needle, haystack, strict) {

    function constructPath(needle, haystack, path, strict) {
        if (!$.isArray(haystack)) {
            return false;
        }
        var index;
        for (index = 0; index < haystack.length; index++) {
            var value = haystack[index];
            var currentPath = $.merge([], path);
            currentPath.push(index);

            if ((strict && value === needle) || (!strict && value == needle)) {
                return currentPath;
            }
            if ($.isArray(value)) {

                var foundPath = constructPath(needle, value, currentPath, strict);
                if (foundPath) {
                    return foundPath;
                }
            }
        }

        return false;
    }

    return constructPath(needle, haystack, [], strict);
}

http://jsfiddle.net/b8TxJ/2/

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