php多维数组唯一具有不同值的make键值数组

Question

i need help for Below Array:

$inputarray = array(
    array("id" => 2,"name" => "ProductName","comment" => "best product comment 1"),
    array("id" => 2,"name" => "ProductName","comment" => "best product comment 2"),
    array("id" => 2,"name" => "ProductName","comment" => "best product comment 3")
);

output should be:

$outputarray = array(
    array("id" => 2,"name" => "ProductName","comment" => array("best product comment 1","best product comment 2","best product comment 3"))
);

i need this "comment" key of value array in return

array_unique

is not working in it. it gives me unique but not that comments array. it's only give me last value of comment key value like below

$outputarray = array(
    array("id" => 2,"name" => "ProductName","comment" => "best product comment 3")
);

please help me out.

Answer 1

You can make use of array_reduce:

<?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;
}, []));

echo '<pre>'; var_dump($output_array); echo '</pre>';

Demo