Файловый менеджер

Файловый менеджер - Редактировать - /home/harasnat/www/learning/lib/openspout/src/Writer/Common/Helper/CellHelper.php

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<?php declare(strict_types=1); namespace OpenSpout\Writer\Common\Helper; /** * @internal / final class CellHelper { /* @var array<int, string> Cache containing the mapping column index => column letters / private static array $columnIndexToColumnLettersCache = []; /* * Returns the column letters (base 26) associated to the base 10 column index. * Excel uses A to Z letters for column indexing, where A is the 1st column, * Z is the 26th and AA is the 27th. * The mapping is zero based, so that 0 maps to A, B maps to 1, Z to 25 and AA to 26. * * @param int $columnIndexZeroBased The Excel column index (0, 42, ...) * * @return string The associated cell index ('A', 'BC', ...) */ public static function getColumnLettersFromColumnIndex(int $columnIndexZeroBased): string { $originalColumnIndex = $columnIndexZeroBased; // Using isset here because it is way faster than array_key_exists... if (!isset(self::$columnIndexToColumnLettersCache[$originalColumnIndex])) { $columnLetters = ''; $capitalAAsciiValue = \ord('A'); do { $modulus = $columnIndexZeroBased % 26; $columnLetters = \chr($capitalAAsciiValue + $modulus).$columnLetters; // substracting 1 because it's zero-based $columnIndexZeroBased = (int) ($columnIndexZeroBased / 26) - 1; } while ($columnIndexZeroBased >= 0); self::$columnIndexToColumnLettersCache[$originalColumnIndex] = $columnLetters; } return self::$columnIndexToColumnLettersCache[$originalColumnIndex]; } }

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