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<?php
namespace Sabre\VObject;
/**
* Useful utilities for working with various strings.
*
* @copyright Copyright (C) 2007-2013 fruux GmbH (https://fruux.com/).
* @author Evert Pot (http://evertpot.com/)
* @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
*/
class StringUtil {
/**
* Returns true or false depending on if a string is valid UTF-8
*
* @param string $str
* @return bool
*/
static function isUTF8($str) {
// First check.. mb_check_encoding
if (!mb_check_encoding($str, 'UTF-8')) {
return false;
}
// Control characters
if (preg_match('%(?:[\x00-\x08\x0B-\x0C\x0E\x0F])%', $str)) {
return false;
}
return true;
}
/**
* This method tries its best to convert the input string to UTF-8.
*
* Currently only ISO-5991-1 input and UTF-8 input is supported, but this
* may be expanded upon if we receive other examples.
*
* @param string $str
* @return string
*/
static function convertToUTF8($str) {
$encoding = mb_detect_encoding($str , array('UTF-8','ISO-8859-1'), true);
if ($encoding === 'ISO-8859-1') {
$newStr = utf8_encode($str);
} else {
$newStr = $str;
}
// Removing any control characters
return (preg_replace('%(?:[\x00-\x08\x0B-\x0C\x0E\x0F])%', '', $newStr));
}
}
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