wangdu_wechat/vendor/maatwebsite/excel/docs/import/chunk.md

Chunk importer

When dealing with big files, it's better to import the data in big chunks. You can enable this with filter('chunk'); To import it into chunks you can use chunk($size, $callback) instead of the normal get(). The first parameter is the size of the chunk. The second parameter is a closure which will return the results.

Excel::filter('chunk')->load('file.csv')->chunk(250, function($results)
{
        foreach($results as $row)
        {
            // do stuff
        }
});

ExcelFile class example:

When working with ExcelFile injections (in the constructor or as method injection), you can enable the chunk filter inside the ExcelFile class

class UserListImport extends \Maatwebsite\Excel\Files\ExcelFile {

    public function getFile()
    {
        return 'file.csv';
    }

    public function getFilters()
    {
        return [
            'chunk'
        ];
    }

}

Injected ExcelFile example:

public function importUserList(UserListImport $import)
{
    $import->chunk(250, function($results)
    {
        // do stuff
        // or return true if you want to stop importing.
    });
}