Converting to GEOJson

<slide>
<title>Converting to GEOJson</title>

<example>
foreach( $s['results'] as $res)
{
    $o = $res['obj'];
    $ret = array(
        'type' => 'Feature',
        'properties' => array( 'popupContent' => '' ),
    );
    if ( isset( $o['tags'] ) ) {
        $name = $content = '';
        foreach ( $o['tags'] as $tagName => $value ) {
            list( $tagName, $value ) = explode( '=', $value );
            if ( $tagName == 'name' ) {
                $name = $value; 
            } else {
                $content .= "<br/>{$tagName}: {$value}\n";
            }
        }
        $ret['properties']['popupContent'] = "<b>{$name}</b>" . $content;
    }
    if ($o['type'] == 1) {
        $ret['geometry'] = array(
            'type' => "Point",
            'coordinates' => $o['loc']
        );
    }
    if ($o['type'] == 2) {
        if ($o['loc'][0] == $o['loc'][count($o['loc']) - 1]) {
            $ret['geometry'] = array(
                'type' => "Polygon",
                'coordinates' => array($o['loc']),
            );
        } else {
            $ret['geometry'] = array(
                'type' => "LineString",
                'coordinates' => $o['loc'],
            );
        }
    }
    $rets[] = $ret;
}
echo json_encode( $rets, JSON_PRETTY_PRINT );
</example>
</slide>