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<?php
namespace Sabre\VObject;
/**
* Useful utilities for working with various strings.
*
* @copyright Copyright (C) fruux GmbH (https://fruux.com/)
* @author Evert Pot (http://evertpot.com/)
* @license http://sabre.io/license/ Modified BSD License
*/
class StringUtil
{
/**
* Returns true or false depending on if a string is valid UTF-8.
*
* @param string $str
*
* @return bool
*/
public static function isUTF8($str)
{
// Control characters
if (preg_match('%[\x00-\x08\x0B-\x0C\x0E\x0F]%', $str)) {
return false;
}
return (bool) preg_match('%%u', $str);
}
/**
* 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 $str
*
* @return string
*/
public static function convertToUTF8($str)
{
$encoding = mb_detect_encoding($str, ['UTF-8', 'ISO-8859-1', 'WINDOWS-1252'], true);
switch ($encoding) {
case 'ISO-8859-1':
$newStr = utf8_encode($str);
break;
/* Unreachable code. Not sure yet how we can improve this
* situation.
case 'WINDOWS-1252' :
$newStr = iconv('cp1252', 'UTF-8', $str);
break;
*/
default:
$newStr = $str;
}
// Removing any control characters
return preg_replace('%(?:[\x00-\x08\x0B-\x0C\x0E-\x1F\x7F])%', '', $newStr);
}
}
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