Laravel How to sort Collection based on array indexes

Question

Basically title is the questions itself. I have a collection, which stores arrays in one of the field. I made a sorting algorithm to sort out those arrays and the result is sorted array:

array:8 [▼
  3 => array:5 [▼
    5 => 100
    1 => 50
    2 => 30
    3 => 20
    4 => 10
  ]
  6 => array:5 [▼
    1 => 100
    5 => 50
    3 => 30
    4 => 20
    2 => 10
  ]
  2 => array:5 [▼
    3 => 100
    5 => 50
    4 => 30
    1 => 20
    2 => 10
  ]

The index of this array 3,6,2 is the ID of the collection. How can I order collection based on this ID's in same order as array ?

You need to use Sortby method of collection check more in detail here : laravel.com/docs/5.5/collections#method-sortby — ankit patel
– ankit patel, Commented Sep 25, 2017 at 3:07

Nitish Kumar · Accepted Answer · 2017-09-25 03:11:30Z

2

Suppose you have array inside $a variable:

$a = array:8 [▼
      3 => array:5 [▼
        5 => 100
        1 => 50
        2 => 30
        3 => 20
        4 => 10
      ]
      6 => array:5 [▼
        1 => 100
        5 => 50
        3 => 30
        4 => 20
        2 => 10
      ]
      2 => array:5 [▼
        3 => 100
        5 => 50
        4 => 30
        1 => 20
        2 => 10
      ]
    ];

then you can sort in ascending order with reference of key from ksort() and have something like this:

foreach($a as $b)
{
    ksort($b);
}

and similarly for descending order you can use krsort().

Hope this helps.

answered Sep 25, 2017 at 3:11

Nitish Kumar

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