Sort elements of an array depending on another array on PHP

Question

How could I sort an array depending on another array, considering that one array has fewer elements than another?

// correct order
$order = ['aaa', 'ccc', 'bbb'];

// my array
$items = [
    'key_one' => 'ccc',
    'key_two' => 'aaa',
    'key_three' => 'ccc',
    'key_four' => 'bbb',
    'key_five' => 'aaa'
];

// the result I want
$items = [
    'key_two' => 'aaa',
    'key_five' => 'aaa'
    'key_one' => 'ccc',
    'key_three' => 'ccc',
    'key_four' => 'bbb'
];

I've tried with array_merge and array_combine but having different number of keys I don't know how to do it.

Rav · Accepted Answer · 2020-05-21 07:31:26Z

1

Use the following code:

 $items = [
    'key_one' => 'ccc',
    'key_two' => 'aaa',
    'key_three' => 'ccc',
    'key_four' => 'bbb',
    'key_five' => 'aaa'
];

function list_cmp($a, $b) 
{ 
 $order = ['aaa', 'ccc', 'bbb'];

  foreach($order as $key => $value) 
    { 
      if($a==$value) 
        { 
          return 0; 
          break; 
        } 

      if($b==$value) 
        { 
          return 1; 
          break; 
        } 
    } 
} 

uasort($items, "list_cmp"); 

print_r($items);

answered May 21, 2020 at 7:31

Rav

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1 Comment

Rav Over a year ago

The result is : Array ( [key_two] => aaa [key_five] => aaa [key_one] => ccc [key_three] => ccc [key_four] => bbb )

PHP Geek · Accepted Answer · 2020-05-21 07:44:00Z

0

try to use the code below

$items = [
        'key_one' => 'ccc',
        'key_two' => 'aaa',
        'key_three' => 'ccc',
        'key_four' => 'bbb',
        'key_five' => 'aaa'
    ];
    $order = ['aaa', 'ccc', 'bbb'];
    $newArray = [];
    foreach ($order as $order) {
        foreach($items as $key => $item){
            if($item == $order){
                $newArray[$key] = $item;
            }
        }
    }
    print_r($newArray);

edited May 21, 2020 at 7:44

answered May 21, 2020 at 7:26

PHP Geek

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2 Comments

Mikel Over a year ago

The problem with asort is that it orders them alphabetically, not according to the order that I have established. asort returns aaa, bbb, ccc and not aaa, ccc, bbb.

PHP Geek Over a year ago

fine you need to append the array by another array.

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