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comparison plugins/libcalendaring/lib/Sabre/VObject/StringUtil.php @ 4:888e774ee983

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libcalendar plugin as distributed
author Charlie Root
date Sat, 13 Jan 2018 08:57:56 -0500
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3:f6fe4b6ae66a 4:888e774ee983
1 <?php
2
3 namespace Sabre\VObject;
4
5 /**
6 * Useful utilities for working with various strings.
7 *
8 * @copyright Copyright (C) 2007-2013 fruux GmbH (https://fruux.com/).
9 * @author Evert Pot (http://evertpot.com/)
10 * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
11 */
12 class StringUtil {
13
14 /**
15 * Returns true or false depending on if a string is valid UTF-8
16 *
17 * @param string $str
18 * @return bool
19 */
20 static function isUTF8($str) {
21
22 // First check.. mb_check_encoding
23 if (!mb_check_encoding($str, 'UTF-8')) {
24 return false;
25 }
26
27 // Control characters
28 if (preg_match('%(?:[\x00-\x08\x0B-\x0C\x0E\x0F])%', $str)) {
29 return false;
30 }
31
32 return true;
33
34 }
35
36 /**
37 * This method tries its best to convert the input string to UTF-8.
38 *
39 * Currently only ISO-5991-1 input and UTF-8 input is supported, but this
40 * may be expanded upon if we receive other examples.
41 *
42 * @param string $str
43 * @return string
44 */
45 static function convertToUTF8($str) {
46
47 $encoding = mb_detect_encoding($str , array('UTF-8','ISO-8859-1'), true);
48
49 if ($encoding === 'ISO-8859-1') {
50 $newStr = utf8_encode($str);
51 } else {
52 $newStr = $str;
53 }
54
55 // Removing any control characters
56 return (preg_replace('%(?:[\x00-\x08\x0B-\x0C\x0E\x0F])%', '', $newStr));
57
58 }
59
60 }
61