Update specific value of key in multidimensional array

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i have tried some several way of updating specific array at specific depth in multidimensional array. Although i am able to update but it is not modifying the original array. Even though i tried the referencing technique of php but it seems odds are not in my favour.

What I have tried:

PHP

let's say, the above array is in function A and i passed that above array, which lets say is $tree[$i]['child'], like below:

PHP

function A($tree) {
   $i = 5;
   $childArr = &$tree[$i]['child'];
   $childArr = findandReplace($childArr);
   dump($childArr); // still same nothing changed at that specific index of array 
}

I was successfully able to find Specific array using

PHP

function findandReplace($array) {

        // Loops through each element. If element again is array, function is recalled. If not, result is echoed.
        foreach($array as $key=>$value)
        { 
            if(is_array($value))
            { 
                findandReplace($value); 
            }
            else{
                if ($key == 'clientCode' && $value == '06459') {
                    // echo $key." = ".$value."<br />\n";
                    $array['individualCommission'] = '10000000000000';                    
                    break;
                }
            } 
        }

        return $array;
    }

so above example i was targeting the array with clientCode = 06459 and if found i was updating its individualCommission key to some value. if i do dump after updating with $array['individualCommission'] = '10000000000000';, it seems, i was able to successfully update it. but unfortunately original array is still same hence unmodified.

Another try i did, it updated that specific array and return that specific array only and i lost all other arrays of multidimensional array.

PHP

function findandReplace($array) {    
        $parent = &$array;
        $iterator = new \RecursiveIteratorIterator( new \RecursiveArrayIterator($array), \RecursiveIteratorIterator::SELF_FIRST );
        // $result = array();
        foreach ($iterator as $key => $item) {
            if ( $key === 'clientCode' && $item == '06459') {

                $parent = (array)$iterator->getInnerIterator();
                $parent['individualCommission'] = '1000000000000000';
                // $array[3]['child'][1]['child'][1]['individualCommission'] = $parentCommission;
                break;
            }
        }
        return $array;

    }

so i will appreciate if anyone would spare some time and find any solution for this simple problem.

Thanks!

Posted 11-Mar-18 12:39pm

Member 13720669

Updated 11-Mar-18 22:28pm

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2 solutions

Solution 1

You need to pass the array by reference. This is done in the definition of findandReplace.
You need

function findandReplace(&$array) { 
 ...

See PHP: Passing by Reference - Manual[^]

Posted 11-Mar-18 15:55pm

Peter_in_2780

Comments

Member 13720669 12-Mar-18 4:16am

Hi, thanks for comment but if you see function A, i am already passing array variable as reference! see this

$childArr = &$tree[$i]['child'];
$childArr = findandReplace($childArr);

although i did put additional & sign in findandReplace function but it didn't effect anything. :(

Peter_in_2780 12-Mar-18 5:52am

No you are not passing it by reference until you specify it in the definition of findandReplace. Read the manual I referenced.

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Member 13720669 · Accepted Answer · 2018-03-11T22:28:00

YAY! finally after 1 day fight with references finally it working. I found the solution to this trickish problem. Although i was passing array in my findandReplace function as reference but i was doing recursion as well. It was losing reference(i believe) while finding particular array in recursion. answer is to put 2 additional references one in the foreach to

$value

and otherone to

findandReplace(&$array)

so final function would be look like this

PHP

function findandReplace(&$array) {
        foreach($array as $key => &$value)
        { 
            if(is_array($value))
            { 
                findandReplace($value); 
            }
            else{
                
                if ($key == 'clientCode' && $value == '06456') {
                    // echo $key." = ".$value."<br />\n";

                    $array['individualCommission'] = '10000000000000';
                    break;
                }
            } 
        }

        return $array;
    }

I hope this will help someone. couldn't find any solution on whole internet!