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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;
}
}