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