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<?php /* * This file is part of the eluceo/iCal package. * * (c) Markus Poerschke <markus@eluceo.de> * * This source file is subject to the MIT license that is bundled * with this source code in the file LICENSE. */ namespace Eluceo\iCal\Util; class ComponentUtil { /** * Folds a single line. * * According to RFC 5545, all lines longer than 75 characters should be folded * * @see https://tools.ietf.org/html/rfc5545#section-5 * @see https://tools.ietf.org/html/rfc5545#section-3.1 * * @param string $string * * @return array */ public static function fold($string) { $lines = []; if (function_exists('mb_strcut')) { while (strlen($string) > 0) { if (strlen($string) > 75) { $lines[] = mb_strcut($string, 0, 75, 'utf-8'); $string = ' ' . mb_strcut($string, 75, strlen($string), 'utf-8'); } else { $lines[] = $string; $string = ''; break; } } } else { $array = preg_split('/(?<!^)(?!$)/u', $string); $line = ''; $lineNo = 0; foreach ($array as $char) { $charLen = strlen($char); $lineLen = strlen($line); if ($lineLen + $charLen > 75) { $line = ' ' . $char; ++$lineNo; } else { $line .= $char; } $lines[$lineNo] = $line; } } return $lines; } }
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