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  1. <?php
  2.  
  3. $array = array(
  4.   5 => array (
  5.       'id' => 5,
  6.       'content' => 'some text',
  7.       'id_rel' => 88
  8.   ),
  9.   49 => array (
  10.         'id' => 49,
  11.       'content'=> 'some text',
  12.       'id_rel' => NULL
  13.   ),
  14.   88 => array (
  15.         'id' => 88,
  16.       'content' => 'some text',
  17.       'id_rel' => 5
  18.   ),
  19.   3 => array (
  20.         'id' => 3,
  21.       'content' => 'some text',
  22.       'id_rel' => NULL
  23.   )
  24. );
  25.  
  26. $newArray = array();
  27. ksort($array);
  28. foreach ($array as $key => $val) {
  29.     // Add it to the new array
  30.     $newArray[$key] = $val;
  31.     // Remove it
  32.     unset($array[$key]);
  33.  
  34.     // If no id_rel, move on
  35.     if (empty($val['id_rel'])) {
  36.         continue;
  37.     }
  38.  
  39.     // Get id_rel's
  40.     foreach ($array as $subKey => $subVal) {
  41.         if ($subKey == $val['id_rel']) {
  42.             $newArray[$subKey] = $subVal;
  43.             unset($array[$subKey]);
  44.         }
  45.     }
  46. }
  47. unset($array, $subKey, $subVal, $key, $val);
  48. print_r($newArray);
Success #stdin #stdout 0.01s 20568KB
comments (?)
stdin 
Standard input is empty
stdout 
Array
(
    [3] => Array
        (
            [id] => 3
            [content] => some text
            [id_rel] => 
        )

    [5] => Array
        (
            [id] => 5
            [content] => some text
            [id_rel] => 88
        )

    [88] => Array
        (
            [id] => 88
            [content] => some text
            [id_rel] => 5
        )

    [49] => Array
        (
            [id] => 49
            [content] => some text
            [id_rel] => 
        )

)
https://ideone.com/SVRq5g
language:
PHP (php 7.3.5)
created:
11 years ago
visibility:
public

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