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  1. <?php
  2. $array = 
  3. array
  4. (
  5.     '0' => array
  6.         (
  7.             'question_id' => 1,
  8.             'question_title' => 'Q1',
  9.             'child_question_id' => NULL 
  10.         ),
  11.  
  12.     '1' => array
  13.         (
  14.             'question_id' => 2,
  15.             'question_title' => 'Q2',
  16.             'child_question_id' => NULL
  17.         ),
  18.  
  19.     '2' => array
  20.         (
  21.             'question_id' => 3,
  22.             'question_title' => 'Q3',
  23.             'child_question_id' => 4
  24.         ),
  25.  
  26.     '3' => array
  27.         (
  28.             'question_id' => 3,
  29.             'question_title' => 'Q3',
  30.             'child_question_id' => 5
  31.         ),
  32.  
  33.     '4' => array
  34.         (
  35.             'question_id' => 4,
  36.             'question_title' => 'Q4',
  37.             'child_question_id' => NULL
  38.         ),
  39.  
  40.     '5' => array
  41.         (
  42.             'question_id' => 5,
  43.             'question_title' => 'Q5',
  44.             'child_question_id' => NULL
  45.         ),
  46.  
  47.     '6' => array
  48.         (
  49.             'question_id' => 6,
  50.             'question_title' => 'Q6',
  51.             'child_question_id' => NULL
  52.         ),
  53.  
  54.     '7' => array
  55.         (
  56.             'question_id' => 7,
  57.             'question_title' => 'Q7',
  58.             'child_question_id' => 6
  59.         )
  60.  
  61. );
  62.  
  63.     $i = 0;
  64. 	$new = array();
  65. 	$unsetter = array();
  66. 	foreach($array as $val)
  67. 	{
  68. 		$new[$i] = array();
  69. 		foreach($val as $key => $data)
  70. 		{
  71. 			if(($key == 'child_question_id') && (!is_null($data)))
  72. 			{
  73. 				$new[$i]['children'] = array();
  74. 				$new[$i]['children']['question_id'] = $data;
  75. 				$new[$i]['children']['question_title'] = $array[$data]['question_title'];
  76. 				$unsetter[] = $data; 
  77.  
  78.  
  79. 			} else {
  80. 				$new[$i][$key] = $data;
  81. 			}
  82. 		}
  83. 		$i++;
  84. 	}
  85. 	foreach($unsetter as $uns)
  86. 	{
  87. 			unset($new[$uns]);
  88. 	}
  89. 	$new = array_values($new);
  90. 	var_dump($new);
Success #stdin #stdout 0.01s 20568KB
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array(5) {
  [0]=>
  array(3) {
    ["question_id"]=>
    int(1)
    ["question_title"]=>
    string(2) "Q1"
    ["child_question_id"]=>
    NULL
  }
  [1]=>
  array(3) {
    ["question_id"]=>
    int(2)
    ["question_title"]=>
    string(2) "Q2"
    ["child_question_id"]=>
    NULL
  }
  [2]=>
  array(3) {
    ["question_id"]=>
    int(3)
    ["question_title"]=>
    string(2) "Q3"
    ["children"]=>
    array(2) {
      ["question_id"]=>
      int(4)
      ["question_title"]=>
      string(2) "Q4"
    }
  }
  [3]=>
  array(3) {
    ["question_id"]=>
    int(3)
    ["question_title"]=>
    string(2) "Q3"
    ["children"]=>
    array(2) {
      ["question_id"]=>
      int(5)
      ["question_title"]=>
      string(2) "Q5"
    }
  }
  [4]=>
  array(3) {
    ["question_id"]=>
    int(7)
    ["question_title"]=>
    string(2) "Q7"
    ["children"]=>
    array(2) {
      ["question_id"]=>
      int(6)
      ["question_title"]=>
      string(2) "Q6"
    }
  }
}
https://ideone.com/uffjS4
language:
PHP (php 7.3.5)
created:
12 years ago
visibility:
public

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