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<?php |
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/** |
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* This file is part of the League.csv library |
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* |
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* @license http://opensource.org/licenses/MIT |
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* @link https://github.com/thephpleague/csv/ |
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* @version 9.0.0 |
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* @package League.csv |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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declare(strict_types=1); |
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namespace League\Csv; |
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use League\Csv\Exception\OutOfRangeException; |
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use ReflectionClass; |
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/** |
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* Returns the BOM sequence found at the start of the string |
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* |
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* If no valid BOM sequence is found an empty string is returned |
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* |
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* @param string $str |
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* |
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* @return string |
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*/ |
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function bom_match(string $str): string |
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{ |
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static $list; |
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$list = $list ?? (new ReflectionClass(ByteSequence::class))->getConstants(); |
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foreach ($list as $sequence) { |
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if (0 === strpos($str, $sequence)) { |
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return $sequence; |
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} |
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} |
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return ''; |
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} |
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/** |
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* Detect Delimiters occurences in the CSV |
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* |
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* Returns a associative array where each key represents |
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* a valid delimiter and each value the number of occurences |
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* |
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* @param Reader $csv the CSV object |
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* @param string[] $delimiters the delimiters to consider |
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* @param int $nb_records Detection is made using $nb_records of the CSV |
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* |
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* @return array |
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*/ |
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function delimiter_detect(Reader $csv, array $delimiters, int $nb_records = 1): array |
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{ |
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$filter = function ($value): bool { |
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return 1 == strlen($value); |
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}; |
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$delimiters = array_unique(array_filter($delimiters, $filter)); |
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if ($nb_records < 1) { |
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throw new OutOfRangeException(sprintf(__FUNCTION__.'() expects the nb_records argument to be a valid positive integer, %s given', $nb_records)); |
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} |
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$stmt = (new Statement()) |
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->where(function (array $record): bool { |
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return count($record) > 1; |
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}) |
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->limit($nb_records) |
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; |
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//cache CSV settings |
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$csv_delimiter = $csv->getDelimiter(); |
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$csv_header_offset = $csv->getHeaderOffset(); |
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$csv->setHeaderOffset(null); |
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$reducer = function (array $result, string $delimiter) use ($csv, $stmt): array { |
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$result[$delimiter] = count( |
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$stmt->process($csv->setDelimiter($delimiter))->fetchAll(), |
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COUNT_RECURSIVE |
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); |
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return $result; |
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}; |
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$result = array_reduce($delimiters, $reducer, []); |
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//restore original CSV settings |
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$csv->setHeaderOffset($csv_header_offset)->setDelimiter($csv_delimiter); |
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arsort($result, SORT_NUMERIC); |
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return $result; |
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} |
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thephpleague /
csv
