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Viewing / Editing File: DecToAlpha.php
<?php namespace Mpdf\Conversion; class DecToAlpha { public function convert($valor, $toUpper = true) { // returns a string from A-Z to AA-ZZ to AAA-ZZZ // OBS: A = 65 ASCII TABLE VALUE if (($valor < 1) || ($valor > 18278)) { return '?'; //supports 'only' up to 18278 } $c2 = $c3 = ''; $c1 = 64 + $valor; // 1 letter (up to 26) if ($valor > 702) { // 3 letters (up to 18278) $c1 = 65 + floor(($valor - 703) / 676); $c2 = 65 + floor((($valor - 703) % 676) / 26); $c3 = 65 + floor((($valor - 703) % 676) % 26); } elseif ($valor > 26) { // 2 letters (up to 702) $c1 = (64 + (int) (($valor - 1) / 26)); $c2 = (64 + ($valor % 26)); if ($c2 === 64) { $c2 += 26; } } $alpha = chr($c1); if ($c2 !== '') { $alpha .= chr($c2); } if ($c3 !== '') { $alpha .= chr($c3); } if (!$toUpper) { $alpha = strtolower($alpha); } return $alpha; } }
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PHP Version: 8.2.29
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