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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 2445, all lines longer than 75 characters will be folded
*
* @link http://www.ietf.org/rfc/rfc2445.txt
*
* @param $string
*
* @return array
*/
public static function fold($string)
{
$lines = array();
$array = preg_split('/(?<!^)(?!$)/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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