Php: Re Order Associative Array

PHP: re order associative array

If you mean to swap two values you could make a function like this:

function array_swap($key1, $key2, $array) {
        $newArray = array ();
        foreach ($array as $key => $value) {
            if ($key == $key1) {
                $newArray[$key2] = $array[$key2];
            } elseif ($key == $key2) {
                $newArray[$key1] = $array[$key1];
            } else {
                $newArray[$key] = $value;
            }
        }
        return $newArray;
    }

How to sort a php associative array to a specific order?

Easy- Just use the arraySort as the assoc key and get the corresponding array / value from the original array,

<?php

$arraySort = [
  "break",  
  "period1", 
  "period2", 
  "period3", 
  "lunch",
  "period4",
  "period5", 
  "period6", 
  "finish" 
];

$final_array = [];

foreach($arraySort  as $arraySo){
  $final_array[$arraySo] = isset($aData[$arraySo]) ? $aData[$arraySo] : [];
}

print_r($final_array);

Output:- https://3v4l.org/4LXvS

PHP re-order array of month names(associative array)

Make order array and then sort by usort functon

$seq = array_flip([ 'August', 'September', 'October',  'November' ]);

usort($arr, function ($i1, $i2) use($seq) { return $seq[$i1['label']] - $seq[$i2['label']]; });  

demo

re arrange php associative array

You can use array_multisort for your permutation. I assume that you know the permutation and don't need to derive it from the key names. Say, you want the order two, three, one, then create a reference array like that:

$permutation = array(3, 1, 2);

Meaning: first item goes to position 3, second item to position 1, third item to position 2

Then, after the switch, permute:

array_multisort($permutation, $example);

This will sort the $permutation array and apply the same order to $example.

php associative array key order (not sort)

Take a look at daniele centamore's comment on PHP's array_splice() function, where he provides a couple of functions for moving the elements in an non-associative array.

<?php

// $input  (Array) - the array containing the element
// $index (int) - the index of the element you need to move

function moveUp($input,$index) {
      $new_array = $input;

       if((count($new_array)>$index) && ($index>0)){
                 array_splice($new_array, $index-1, 0, $input[$index]);
                 array_splice($new_array, $index+1, 1);
             } 

       return $new_array;
}

function moveDown($input,$index) {
       $new_array = $input;

       if(count($new_array)>$index) {
                 array_splice($new_array, $index+2, 0, $input[$index]);
                 array_splice($new_array, $index, 1);
             } 

       return $new_array;
}  

$input = array("red", "green", "blue", "yellow");

$newinput = moveUp($input, 2);
// $newinput is array("red", "blue", "green", "yellow")

$input = moveDown($newinput, 1);
// $input is array("red", "green", "blue", "yellow")

?>

Sort associative array by key php

Create an array that defines the order you want.

$order = ['C' => 0, 'A' => 1, 'B' => 2];

Then pass that array into the usort comparison function with use. In the comparison function, look up the sort order in the $order array by key using the letter from the items you're sorting.

usort($array, function($a, $b) use ($order) {
    return $order[$a['letter']] <=> $order[$b['letter']];
});

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You can also create the $sort array without explicitly assigning numeric values using array_flip

$order = array_flip(['C', 'A', 'B']);

Sort an array of associative arrays by column value

You are right, the function you're looking for is array_multisort().

Here's an example taken straight from the manual and adapted to your case:

$price = array();
foreach ($inventory as $key => $row)
{
    $price[$key] = $row['price'];
}
array_multisort($price, SORT_DESC, $inventory);

As of PHP 5.5.0 you can use array_column() instead of that foreach:

$price = array_column($inventory, 'price');

array_multisort($price, SORT_DESC, $inventory);

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