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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) 2011-2015 fruux GmbH (https://fruux.com/).
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9 * @author Evert Pot (http://evertpot.com/)
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10 * @license http://sabre.io/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 $str
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18 * @return bool
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19 */
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20 static public function isUTF8($str) {
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21
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22 // Control characters
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23 if (preg_match('%[\x00-\x08\x0B-\x0C\x0E\x0F]%', $str)) {
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24 return false;
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25 }
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26
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27 return (bool)preg_match('%%u', $str);
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28
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29 }
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30
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31 /**
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32 * This method tries its best to convert the input string to UTF-8.
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33 *
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34 * Currently only ISO-5991-1 input and UTF-8 input is supported, but this
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35 * may be expanded upon if we receive other examples.
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36 *
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37 * @param string $str
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38 * @return string
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39 */
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40 static public function convertToUTF8($str) {
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41
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42 $encoding = mb_detect_encoding($str , array('UTF-8','ISO-8859-1', 'WINDOWS-1252'), true);
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43
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44 switch($encoding) {
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45 case 'ISO-8859-1' :
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46 $newStr = utf8_encode($str);
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47 break;
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48 /* Unreachable code. Not sure yet how we can improve this
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49 * situation.
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50 case 'WINDOWS-1252' :
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51 $newStr = iconv('cp1252', 'UTF-8', $str);
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52 break;
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53 */
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54 default :
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55 $newStr = $str;
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56
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57 }
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58
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59 // Removing any control characters
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60 return (preg_replace('%(?:[\x00-\x08\x0B-\x0C\x0E-\x1F\x7F])%', '', $newStr));
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61
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62 }
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63
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64 }
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65
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