StringUtil.php
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StringUtil.php
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	<?php

	namespace Sabre\VObject;

	/**
	* Useful utilities for working with various strings.
	*
	* @copyright Copyright (C) 2011-2015 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 $str
	* @return bool
	*/
	static public function isUTF8($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 $str
	* @return string
	*/
	static public function convertToUTF8($str) {

	$encoding = mb_detect_encoding($str , array('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));

	}

	}