save big data with laravel

ini_set('max_execution_time', 120 ) ; // time in seconds

$insert_data = [];

foreach ($json['value'] as $value)
{
   ...
}

$insert_data = [];

foreach ($json['value'] as $value) {
    $posting_date = Carbon::parse($value['Posting_Date']);

    $posting_date = $posting_date->format('Y-m-d');

    $data = [
        'item_no'                   => $value['Item_No'],
        'entry_no'                  => $value['Entry_No'], 
        'document_no'               => $value['Document_No'],
        'posting_date'              => $posting_date,
        ....
    ];

    $insert_data[] = $data;
}

$insert_data = collect($insert_data); // Make a collection to use the chunk method

// it will chunk the dataset in smaller collections containing 500 values each. 
// Play with the value to get best result
$chunks = $insert_data->chunk(500);

foreach ($chunks as $chunk)
{
   \DB::table('items_details')->insert($chunk->toArray());
}