Change PHP array into an array of arrays

Question

I have an array that look like this

(
 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'
           )
)

I am trying to restructure it to be more like the following

(
 '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'
                               )
)

I tried different function but cannot get it to work. Any help would be greatly appreciated. Thank you.

See codereview.stackexchange.com/questions/23919/…

p.s.w.g
– p.s.w.g

2015-01-09 22:55:28 +00:00
Commented Jan 9, 2015 at 22:55 — p.s.w.g
– p.s.w.g, Commented Jan 9, 2015 at 22:55
Please share what you have tried.

Jay Blanchard
– Jay Blanchard

2015-01-09 23:01:41 +00:00
Commented Jan 9, 2015 at 23:01 — Jay Blanchard
– Jay Blanchard, Commented Jan 9, 2015 at 23:01

imnancysun · Accepted Answer · 2015-01-09 23:15:46Z

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']);
}

answered Jan 9, 2015 at 23:15

imnancysun

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1 Comment

user1709251 Over a year ago

This solution works just fine. Items from the initial array are grouped by type perfectly. Cheers Friend

WoMo · Accepted Answer · 2015-01-09 23:03:01Z

0

What I have done in the past is to loop through and create a new array using your desired value as a new key:

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

There is probably a more elegant way...

answered Jan 9, 2015 at 23:03

WoMo

7,2862 gold badges31 silver badges37 bronze badges

Comments

OnlyMAJ · Accepted Answer · 2015-01-09 23:03:14Z

lets assume first array is $array1 and second is $array2,then try this :

 $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);

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