root/geowiki/shared.php

<?php

//returns position of last occurrence of $needle in $haystack, left from $offset
//modified gordon's proposal on http://in2.php.net/manual/en/function.strrpos.php
//$offset <= 0 will search from the end of the string (0 from last character)
function searchBack($haystack, $needle, $offset=0) {
    $strrpos = false;
    if (is_string($haystack) && is_string($needle) && is_numeric($offset)) {
        $strlen = strlen($haystack);
        if ($offset <= 0)
            $offset = $strlen + $offset;

        $strpos = strpos(strrev(substr($haystack, 0, $offset)), strrev($needle));
        if (is_numeric($strpos)) {
            $strrpos = $offset - $strpos - strlen($needle);
        }
    }
    return $strrpos;
}

//log an $action on $item into $logFile
function changeLog($logFile, $action, $item) {
    $timeStamp = date('Y-m-d G:i:s T');
    $logString = "<history:$action><date>$timeStamp</date>$item</history:$action>\n";
    $fh = fopen($logFile, 'a');
    fwrite($fh, $logString);
    fclose($fh);
}

//makes an array out of $string and trims it
function getTrimmedArray($separator, $string) {
    $tmp = explode($separator, $string);
    for ($i = 0; $i < count($tmp); $i++)
        $tmp[$i] = trim($tmp[$i]);
    return $tmp;
}

//return the content of $xml between the strings $start and $end
function getContent($xml, $startTag, $endTag) {
    $content = "";
    $startPos = strpos($xml, $startTag);
    if ($startPos === false)
        return $content;
        
    $endPos = strpos($xml, $endTag, $startPos);
    if ($endPos === false)
        return $content;
    
    $startPos += strlen($startTag);
    $content = substr($xml, $startPos, $endPos - $startPos);
//    echo $startPos, ":", $endPos, ":", ($endPos - $startPos), strlen($content);
    return $content;
}

function getTagContent($xml, $tag) {
    return getContent($xml, "<$tag>", "</$tag>");
}

//$item: xml string, containing the data for one item
//returns a list with the entries
function xml2fields($item) {
    $url = getTagContent($item, "link");
    $title = getTagContent($item, "title");
    $desc = getTagContent($item, "description");
    $desc = substr($desc, 9);
    $desc = substr($desc, 0, strlen($desc) - 3);
    $user = getTagContent($item, "author");
    
    $geoType = "point";
    $coords = "";

    $line = getTagContent($item, "geo:line");
    $poly = getTagContent($item, "geo:polygon");
    if ($line != "") {
        $geoType = "line";
        $coords = $line;
//        $coords = str_replace(" ", "\n", $line);        
    }
    else if ($poly != "") {
        $geoType = "polygon";
        $coords = $poly;
//        $coords = str_replace(" ", "\n", $poly);
    }
    else {
        $lat = getTagContent($item, "geo:lat");
        $lon = getTagContent($item, "geo:long");
        if ($lat != "" && $lon != "")
            $coords = $lat . "," . $lon;
    }

    $imgurl = getTagContent($item, "photo:thumbnail");

    $tags = "";
    $categories = str_replace("</category><category>", ", ", $item);
    $tags = getTagContent($categories, "category");
    
    return array($title, $url, $desc, $imgurl, $tags, $coords, $geoType, $user);
}

//builds the xml item-tag from the given values
function fields2xml($uid,$title,$url,$description,$imgurl,$tags,$coords,$geoType,$user) {
    $item = '';
    if (empty($coords))
        return $item;
    if (empty($file))
        $file = "rss.xml";
    
    //<category>
    $catTag = "";
    $tmp = explode(",", $tags);
    foreach($tmp as $tag) {
        $catTag .= "<category>" . trim($tag) . "</category>";
    }

    //<photo:thumbnail>
    $imgTag = "";
    if (!empty($imgurl)) {
        $imgTag = "<photo:thumbnail>" . $imgurl . "</photo:thumbnail>";
    }
    
    //<guid>
    $uidTag = "";
    if (!empty($uid)) $uidTag = "<guid>$uid</guid>";

    //<geo:..> (coordinates)
    $coordString = trim($coords);

    if ($geoType == "point") {
        $tmp = explode(",", $coordString);
        $coordTag = "<geo:lat>$tmp[0]</geo:lat><geo:long>$tmp[1]</geo:long>";
    }
    else if ($geoType == "line")
        $coordTag = "<geo:line>$coordString</geo:line>";
    else if ($geoType == "polygon")
        $coordTag = "<geo:polygon>$coordString</geo:polygon>";

    //construct rss Tag
    $item = "<item>" . $uidTag . "<title>$title</title><link>$url</link><description><![CDATA[" . $description . "]]></description><author>$user</author>" . $coordTag . $catTag . $imgTag . "</item>";

    return $item;
}

//echo getTagContent("<ab>lab</ab>", "ab");
//echo fields2xml('$uid','$title','$url','$description','$imgurl','$tags','1,2 3,4 5,6','polygon','$user');
?>