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How to use foreach to convert an array in PHP

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Release： 2023-03-19 20:32:01

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This article mainly shares with you an article about the magical conversion array of PHP using foreach (explanation with examples). It has a good reference value and I hope it will be helpful to everyone. Let’s follow the editor to take a look, I hope it can help everyone.

Requirements:

Convert the two-dimensional array $arr into a two-dimensional array with 'time' and 'type' as subscripts and 'data' as the value;

Original array:

$arr = array(
   0 => array(
    'data' => 100,
    'type' => 1,
    'time' => '2018-01-26',
   ),
   1 => array(
    'data' => 200,
    'type' => 2,
    'time' => '2018-01-26',
   ),
   2 => array(
    'data' => 300,
    'type' => 2,
    'time' => '2018-01-27',
   ),
   3 => array(
    'data' => 400,
    'type' => 3,
    'time' => '2018-01-27',
   ),
   4 => array(
    'data' => 500,
    'type' => 4,
    'time' => '2018-01-28',
   ),
  );

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Conversion:

foreach ($arr as $key => $value) {
 $change[$value['time']][$value['type']] = $value['data'];
}

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Result:

array(3) {
 ["2018-01-26"] => array(2) {
 [1] => int(100)
 [2] => int(200)
 }
 ["2018-01-27"] => array(2) {
 [2] => int(300)
 [3] => int(400)
 }
 ["2018-01-28"] => array(1) {
 [4] => int(500)
 }
}

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Related recommendations:

foreach and A brief introduction to each

Analysis of PHP loop statements—while, for, foreach, do while

For and foreach traverse arrays in PHP Detailed explanation of the difference

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