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@ 2018-10-11T06:51:31Z

<?php
$input_array = [
  ['id' => 2, 'name' => 'ProductName', 'comment' => 'best product comment 1'],
  ['id' => 2, 'name' => 'ProductName', 'comment' => 'best product comment 2'],
  ['id' => 2, 'name' => 'ProductName', 'comment' => 'best product comment 3'],
  ['id' => 3, 'name' => 'ProductName2', 'comment' => 'best product comment 4'],
  ['id' => 3, 'name' => 'ProductName2', 'comment' => 'best product comment 5']
];

$output_array = array_values(array_reduce($input_array, function($output_array, $item) {
  if (array_key_exists($item['id'], $output_array))
    $output_array[$item['id']]['comment'][] = $item['comment'];
  else
  {
    $item['comment'] = (array)$item['comment'];
    $output_array[$item['id']] = $item;
  }
  return $output_array;
}, []));

var_dump($output_array);

Output for git.master_jit, git.master, rfc.property-hooks: array(2) { [0]=> array(3) { ["id"]=> int(2) ["name"]=> string(11) "ProductName" ["comment"]=> array(3) { [0]=> string(22) "best product comment 1" [1]=> string(22) "best product comment 2" [2]=> string(22) "best product comment 3" } } [1]=> array(3) { ["id"]=> int(3) ["name"]=> string(12) "ProductName2" ["comment"]=> array(2) { [0]=> string(22) "best product comment 4" [1]=> string(22) "best product comment 5" } } }

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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