javascript - Display data in array descending order

Solution:

you can simply sort your parent array and then take your data from that array. lets say you have an array like

$data = array(
    array(
        "name"=>"Urus", 
        "total"=>60
    ),
    array(
        "name"=>"Cayenne", 
        "total"=>85
    ),
    array(
        "name"=>"Bentayga", 
        "total"=>55
    ),
    array(
        "name"=>"Lamborghini", 
        "total"=>85
    ),
    array(
        "name"=>"Porsche", 
        "total"=>90
    ),
    array(
        "name"=>"Bentley", 
        "total"=>55
    ),
    array(
        "name"=>"Nissan", 
        "total"=>70
    ),
);

now you want to sort that array using the total of the inner array. use array_multisort and array_column to do that.

array_multisort( array_column($data, "total"), SORT_DESC, $data );

this will generate an sorted array like

array:7 [▼
  0 => array:2 [▼
    "name" => "Porsche"
    "total" => 90
  ]
  1 => array:2 [▼
    "name" => "Cayenne"
    "total" => 85
  ]
  2 => array:2 [▼
    "name" => "Lamborghini"
    "total" => 85
  ]
  3 => array:2 [▼
    "name" => "Nissan"
    "total" => 70
  ]
  4 => array:2 [▼
    "name" => "Urus"
    "total" => 60
  ]
  5 => array:2 [▼
    "name" => "Bentayga"
    "total" => 55
  ]
  6 => array:2 [▼
    "name" => "Bentley"
    "total" => 55
  ]
]

and now you have nothing more to do. just loop over the array and take values.

$labels = $graph_data = [];   
foreach ($data as $key => $student) {
    if ($key < 5) {
        $labels[] = $student['name'];
        $graph_data[] = $student['total'];
    } else {
        break;
    }  
}

$array = [
    [
        'label' => 'Total Sales',
        'color' => '#fec12c',
        'data' => $graph_data
    ]
];

$graph_data = [];

return [
    'labels' => $labels,
    'datasets' => $array
];

Solution:

you can use array data manipulation rsort() for des order and array_slice() to take 5

public function dataStudentGraph($data)
{

    $labels = [];
    $graph_data = [];
    foreach ($data['data'] as $student) {
        $labels[] = $student['name'];
        $graph_data[] = $student['total'];
    }
    $backupData = $graph_data;
    rsort($graph_data); // des order 

    $sortedLabels = [];
    foreach ($graph_data as $i => $data) {
        $index = array_search($data, $backupData);
        $sortedLabels[$i] = $labels[$index];
    }

    $array = [
        [
            'label' => 'Total Sales',
            'color' => '#fec12c',
            'data' => array_slice($graph_data, 0, 5) // take 5 
        ]
    ];
    $graph_data = [];
    return [
        'labels' => $sortedLabels,
        'datasets' => $array
    ];
}

ref link

https://www.w3schools.com/php/php_arrays_sort.asp https://www.w3schools.com/php/func_array_slice.asp https://www.php.net/manual/en/function.array-search.php