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Filename : ConvertEmptyCellValuesToNull.php

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<?php

namespace Maatwebsite\Excel\Middleware;

class ConvertEmptyCellValuesToNull extends CellMiddleware
{
    /**
     * @param  mixed  $value
     * @return mixed
     */
    public function __invoke($value, callable $next)
    {
        return $next(
            $value === '' ? null : $value
        );
    }
}