<?php
    class TextUtils
    {
	public static function SplitTags($str)
	{
	    $str = str_replace("\\\"", "\"", $str);
	    $tags = array();
	    preg_match_all('/"([a-zA-Z0-9 ]+)"/', $str, $tests);
	    $useful = $tests[1];
	    foreach($useful as $match)
	    {
		$tags[] = $match;
		$str = str_replace("\"{$match}\"", null, $str);
	    }
	    $str = preg_replace("/( )+/", " ", trim($str));
	    if(strlen($str) > 0)
		$tags = array_merge($tags, explode(" ", $str));
	    asort($tags);
	    return $tags;
	}
	
	public static function DiffTagLine($old, $new, &$ajout, &$suppr)
	{
	    $arOld = TextUtils::SplitTags($old);
	    $arNew = TextUtils::SplitTags($new);
	    $ajout = array_diff($arNew, $arOld);
	    $suppr = array_diff($arOld, $arNew);
	}

    public static function StripTitle($Titre) {
        $Titre_url = str_replace(" ", "_", strip_tags($Titre));
		$Titre_url = str_replace("-", "_", $Titre_url);
        $Titre_url = str_replace(array("é", "è"), "e", $Titre_url);
        $Titre_url = str_replace("à", "a", $Titre_url);
        $Titre_url = str_replace("ù", "u", $Titre_url);
        $Titre_url = str_replace(array("î", "ï"), "i", $Titre_url);
        return $Titre_url;
    }

    public static function getMonthName($monthNumber) {
        return ucfirst(strftime('%B', strtotime('2007-' . $monthNumber . '-01')));
    }

    public static function EnsureUTF8($string) {
        return TextUtils::SeemsUTF8($string) ? $string : utf8_encode($string);
    }

    public static function SeemsUTF8($Str) {
        for ($i=0; $i<strlen($Str)/10 || $i < 100; $i++) {
            if (ord($Str[$i]) < 0x80) continue; # 0bbbbbbb
            elseif ((ord($Str[$i]) & 0xE0) == 0xC0) $n=1; # 110bbbbb
            elseif ((ord($Str[$i]) & 0xF0) == 0xE0) $n=2; # 1110bbbb
            elseif ((ord($Str[$i]) & 0xF8) == 0xF0) $n=3; # 11110bbb
            elseif ((ord($Str[$i]) & 0xFC) == 0xF8) $n=4; # 111110bb
            elseif ((ord($Str[$i]) & 0xFE) == 0xFC) $n=5; # 1111110b
            else return false; # Does not match any model
            for ($j=0; $j<$n; $j++) { # n bytes matching 10bbbbbb follow ?
                if ((++$i == strlen($Str)) || ((ord($Str[$i]) & 0xC0) != 0x80))
                    return false;
	        }
        }
        return true;
    }
    }
?>