PHP Sort associative array based on array values

Question

I currently have an associative array of values that I need sorted based on values in another array.

Example:

If I have an array of values, AssocArray = '122'=>'12', '123'=>'32', '232'=>'54', '343'=>'12'

I need to check it against another array of values, orderArray = '232', '123'

if it exists then push the value to the top of the AssocArray. so the final array looks like this.

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

Sorry I do not have any working code, I am still learning PHP.

Any help would be really grateful :) Thank you.

Look here: http://stackoverflow.com/questions/777597/sorting-an-associative-array-in-php — Matthew Blancarte, Sep 06 '12 at 20:58

nickb · Accepted Answer · 2012-09-06T21:06:28.560

Loop through your $orderArray, and check if an element with that key is present in $AssocArray. If it is, add that element to the $result array, and remove it from the original $AssocArray. Then, you just have to merge the remaining elements in $AssocArray with whatever was pushed to the top of the $results array:

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

rsort( $orderArray, SORT_STRING); // Make sure the order array is sorted from highest to lowest

$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); // Print the resulting array

You can see that this prints:

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

score 0 · Answer 2 · answered Sep 06 '12 at 21:05

$orderArray = array("232", "123");

function customSort($key1, $key2){
    $key1Pos = array_search($key1, $orderArray);
    $key2Pos = array_search($key2, $orderArray);
    if($key1Pos !== NULL && $key2Pos != NULL){
        return $key1Pos - $key2Pos;
    }else if($key1Pos === NULL){
        return 1;
    }else{
        return -1;
    }
}


uksort($array, "customSort");

PHP Sort associative array based on array values

2 Answers2