Question

我有一个看起来像这样的数组

(
 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

(
 '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，但无法让它发挥作用。任何帮助将不胜感激。谢谢。

Answer 1

$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']);
}

Answer 2

我过去所做的是使用您想要的值作为新密钥循环并创建一个新数组：

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

可能有一种更优雅的方式......

Answer 3

假设第一个数组是$ array1，第二个数组是$ array2，那么试试这个：

 $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);

将PHP数组更改为数组数组

3 个答案: