62 lines
1.4 KiB
PHP
62 lines
1.4 KiB
PHP
<?php
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namespace Sabre\VObject;
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/**
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* Useful utilities for working with various strings.
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*
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* @copyright Copyright (C) 2011-2015 fruux GmbH (https://fruux.com/).
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* @author Evert Pot (http://evertpot.com/)
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* @license http://sabre.io/license/ Modified BSD License
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*/
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class StringUtil {
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/**
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* Returns true or false depending on if a string is valid UTF-8
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*
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* @param string $str
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* @return bool
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*/
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static function isUTF8($str) {
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// First check.. mb_check_encoding
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if (!mb_check_encoding($str, 'UTF-8')) {
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return false;
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}
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// Control characters
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if (preg_match('%(?:[\x00-\x08\x0B-\x0C\x0E\x0F])%', $str)) {
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return false;
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}
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return true;
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}
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/**
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* This method tries its best to convert the input string to UTF-8.
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*
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* Currently only ISO-5991-1 input and UTF-8 input is supported, but this
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* may be expanded upon if we receive other examples.
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*
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* @param string $str
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* @return string
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*/
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static function convertToUTF8($str) {
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$encoding = mb_detect_encoding($str , array('UTF-8','ISO-8859-1'), true);
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if ($encoding === 'ISO-8859-1') {
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$newStr = utf8_encode($str);
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} else {
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$newStr = $str;
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}
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// Removing any control characters
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return (preg_replace('%(?:[\x00-\x08\x0B-\x0C\x0E\x0F])%', '', $newStr));
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}
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}
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