将 PHP 数组更改为数组的数组

Question

我有一个像这样的数组

(
 0 => array( id     => '1',
             title  => 'some title',
             type   => 'fiction'
           )
 1 => array( id    => '2',
             title  => 'some title',
             type   => 'fiction'
           )
 2 => array( id     => '3',
             title  => 'some title',
             type   => 'Romance'
           )
)

我正在尝试将其重组为更像以下内容

(
 'fiction' => array( 0 => array( id     => '1',
                                 title  => 'some title',
                               )
                     1 => array( id     => '2',
                                 title  => 'some title'
                               ), 
 'Romance' => array( 0 => array( id     => '2',
                                 title  => 'some title'
                               )
)

我尝试了不同的功能，但无法正常工作。任何帮助将不胜感激。谢谢。

Answer 1

我过去所做的是循环遍历并使用您想要的值作为新键创建一个新数组：

$newList = array();
foreach ($yourArray as $book) {
  $newList[$book['title']][] = $book;
  // Optionally unset 'title' from $book if it matters.
}

可能有更优雅的方式...

Answer 2

让我们假设第一个数组是 $array1，第二个是 $array2，然后试试这个：

 $array1 = array(
 0 => array(  'id'     => '1',
                    'title'  => 'some title',
                    'type'   => 'fiction'
            ),
 1 => array( 'id'    => '2',
             'title'  => 'some title',
             'type'   => 'fiction'
           ),
 2 => array( 'id'     => '3',
             'title'  => 'some title',
             'type'   => 'Romance'
           )
);
$array2 = array();
foreach($array1 as $each)
    $array2[$each['type']][] = array_slice($each,0,2);

print_r($array1);
print_r($array2);

Answer 3

$a1 = array(
 0 => array( 'id'     => '1',
             'title'  => 'some title',
             'type'   => 'fiction'
           ),
 1 => array( 'id'    => '2',
             'title'  => 'some title',
             'type'   => 'fiction'
           ),
 2 => array( 'id'     => '3',
             'title'  => 'some title',
             'type'   => 'Romance'
           )
);
$a2 = array();
foreach($a1 as $item)
{

    $a2[$item['type']][] = array('id'=> $item['id'], 'title'=> $item['title']);
}

将 PHP 数组更改为数组的数组

Change PHP array into an array of arrays

php

arrays