How to Organize Associative Array by Array Values in PHP

Question

How to Organize Associative Array by Array Values in PHP

I have a set of values in an associative array that I need to sort based on another array of values.

For example:

If my associative array is: AssocArray = '122'=>'12', '123'=>'32', '232'=>'54', '343'=>'12'

I want to compare it with another array of values, orderArray = '232', '123'

If the value exists, move it to the top of AssocArray. So the final array should look like this.

AssocArray = '232'=>'54', '123'=>'32', '122'=>'12', '343'=>'12'

I don't have any code working right now as I'm still learning PHP.

Any help would be greatly appreciated :) Thank you.

php multidimensional-array sorting

Answer 1

Answer №1

Iterate over the elements in $orderArray, checking for existence of each key in $AssocArray. If found, add the element to a new array called $result and remove it from $AssocArray. Finally, merge any remaining items in $AssocArray with the contents of the $results array:


$AssocArray = array( '122'=>'12', '123'=>'32', '232'=>'54', '343'=>'12');
$orderArray = array('232', '123');

rsort($orderArray, SORT_STRING); // Sort order array in descending order

$result = array();
foreach($orderArray as $key) {
    if(isset($AssocArray[$key])) {
        $result[$key] = $AssocArray[$key];
        unset($AssocArray[$key]);
    }
}

foreach($AssocArray as $k => $v) {
    $result[$k] = $v;
}

print_r($result); // Output the resulting merged array

The output displayed is similar to what can be seen here:


Array
(
    [232] => 54
    [123] => 32
    [122] => 12
    [343] => 12
)

Answer 2

Iterate over the elements in $orderArray, checking for existence of each key in $AssocArray. If found, add the element to a new array called $result and remove it from $AssocArray. Finally, merge any remaining items in $AssocArray with the contents of the $results array:


$AssocArray = array( '122'=>'12', '123'=>'32', '232'=>'54', '343'=>'12');
$orderArray = array('232', '123');

rsort($orderArray, SORT_STRING); // Sort order array in descending order

$result = array();
foreach($orderArray as $key) {
    if(isset($AssocArray[$key])) {
        $result[$key] = $AssocArray[$key];
        unset($AssocArray[$key]);
    }
}

foreach($AssocArray as $k => $v) {
    $result[$k] = $v;
}

print_r($result); // Output the resulting merged array

The output displayed is similar to what can be seen here:


Array
(
    [232] => 54
    [123] => 32
    [122] => 12
    [343] => 12
)

Answer 3

Answer №2

$items = array("apple", "banana");

function customOrder($item1, $item2){
    $item1Index = array_search($item1, $items);
    $item2Index = array_search($item2, $items);
    if($item1Index !== NULL && $item2Index != NULL){
        return $item1Index - $item2Index;
    }else if($item1Index === NULL){
        return 1;
    }else{
        return -1;
    }
}

uksort($list, "customOrder");

Answer 4

$items = array("apple", "banana");

function customOrder($item1, $item2){
    $item1Index = array_search($item1, $items);
    $item2Index = array_search($item2, $items);
    if($item1Index !== NULL && $item2Index != NULL){
        return $item1Index - $item2Index;
    }else if($item1Index === NULL){
        return 1;
    }else{
        return -1;
    }
}

uksort($list, "customOrder");

How to Organize Associative Array by Array Values in PHP

Answer №1

Answer №2

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