Craft\ImportService::_open PHP Method

    protected function _open($file)
    {
        if (!count($this->_data)) {
            // Turn asset into a file
            $asset = craft()->assets->getFileById($file);
            $source = $asset->getSource();
            $sourceType = $source->getSourceType();
            $file = $sourceType->getLocalCopy($asset);
            // Check if file exists in the first place
            if (file_exists($file)) {
                // Automatically detect line endings
                @ini_set('auto_detect_line_endings', true);
                // Open file into rows
                $lines = file($file, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
                // Detect delimiter from first row
                $delimiters = array();
                $delimiters[ImportModel::DelimiterSemicolon] = substr_count($lines[0], ImportModel::DelimiterSemicolon);
                $delimiters[ImportModel::DelimiterComma] = substr_count($lines[0], ImportModel::DelimiterComma);
                $delimiters[ImportModel::DelimiterPipe] = substr_count($lines[0], ImportModel::DelimiterPipe);
                // Sort by delimiter with most occurences
                arsort($delimiters, SORT_NUMERIC);
                // Give me the keys
                $delimiters = array_keys($delimiters);
                // Use first key -> this is the one with most occurences
                $delimiter = array_shift($delimiters);
                // Open file and parse csv rows
                $handle = fopen($file, 'r');
                while (($row = fgetcsv($handle, 0, $delimiter)) !== false) {
                    // Add row to data array
                    $this->_data[] = $row;
                }
                fclose($handle);
            }
        }
        // Return data array
        return $this->_data;
    }