如何将键值对替换为多维数组中的另一个键值

Question

I have a multidimensional array with an arbitrary number of arrays.

The array is called charge_codes .

print_r( $charge_codes )

Array
(
    [0] => Array
        (
            [charge_code] => 21
            [amount] => 134.57
        )

    [1] => Array
        (
            [charge_code] => 4
            [amount] => 8.05
        )

    [2] => Array
        (
            [charge_code] => 23
            [amount] => 1.68
        )

    [3] => Array
        (
            [charge_code] => 62
            [amount] => 134.12
        )

)

I am trying to loop through the array and find the amount for charge code 62 and assign it to the amount for charge code 21. Once The amount has been assigned to charge code 21, I need to remove the array with charge code 62.

Result I am wanting

Array
(
        [0] => Array
            (
                [charge_code] => 21
                [amount] => 134.12
            )

        [1] => Array
            (
                [charge_code] => 4
                [amount] => 8.05
            )

        [2] => Array
            (
                [charge_code] => 23
                [amount] => 1.68
            ) 

    )

Should i loop through using foreach( $charge_codes as $key = > $value ) ?

Answer 1

    $change_key = 0;
    $amount = 0;

    foreach($charge_codes as $key=>$value){
     if($value["charge_code"] == 21)
     {
      $change_key = $key;
     }
     if($value["charge_code"] == 62)
     {
      $amount = $value["amount"];
      unset($charge_codes[$key]);
     }
    }

    if($amount != 0){
     $charge_codes[$change_key]["amount"] = $amount;
    }
    print_r($charge_codes);

Try this code.

Answer 2

<?php
$arr = [
    ["charge_code" => 21, "amount" => 134.57],
    ["charge_code" => 4, "amount" => 8.05],
    ["charge_code" => 23, "amount" => 1.68],
    ["charge_code" => 62, "amount" => 134.12] 
];

/**
* @Function to search the index from array
*
* @Args: charge code
*
* @Returns: null | index
*/
function searchIndexByChargeCode($chargeCode) {
    global $arr;
    foreach ($arr as $index=>$vals) {
        if (!empty($vals["charge_code"])) {
            if ($vals["charge_code"] == $chargeCode) {
                return $index;
            }
        }
    }
    return null; 
}

$index62 = searchIndexByChargeCode(62);
$index21 = searchIndexByChargeCode(21);
$arr[$index21]["amount"] = $arr[$index62]["amount"];
unset($arr[$index62]); 
?>