PHP - Storing Values In Session Variable And Doing Simple Calculations.

CREATE TABLE `pois` (
  `id` bigint(20) unsigned NOT NULL,
  `lat` float(10,7) NOT NULL,
  `lon` float(10,7) NOT NULL,
  PRIMARY KEY (`id`)
)

CREATE TABLE `pois_tag` (
  `poisid` int(11) NOT NULL DEFAULT '0',
  `tagname` varchar(45) NOT NULL DEFAULT '',
  `tagvalue` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`poisid`,`tagname`)
)

<?php

$db = new mysqli(localhost,root,rimbaud,'test'); // use your credentials

$xmlstr = <<<XML
<data>
<node id="2064639440" lat="49.4873181" lon="8.4710548">
    <tag k="amenity" v="restaurant"/>
    <tag k="cuisine" v="turkish"/>
    <tag k="email" v="info@lynso.de"/>
    <tag k="name" v="Kilim  - Café und Bar Restaurant"/>
    <tag k="opening_hours" v="Su-Th 17:00-1:00; Fr, Sa 17:00-3:00"/>
    <tag k="operator" v="Cengiz Kaya"/>
    <tag k="phone" v="06 21 - 43 755 371"/>
    <tag k="website" v="http://www.kilim-mannheim.de/"/>
  </node>
  <node id="2126473801" lat="49.4851170" lon="8.4756295">
    <tag k="amenity" v="restaurant"/>
    <tag k="cuisine" v="italian"/>
    <tag k="email" v="mannheim1@vapiano.de"/>
    <tag k="fax" v="+49 621 1259 779"/>
    <tag k="name" v="Vapiano"/>
    <tag k="opening_hours" v="Su-Th 10:00-24:00; Fr-Sa 10:00-01:00"/>
    <tag k="operator" v="Vapiano"/>
    <tag k="phone" v="+49 621 1259 777"/>
    <tag k="website" v="http://www.vapiano.de/newsroom/?store=29"/>
    <tag k="wheelchair" v="yes"/>
  </node>
  <node id="667927886" lat="49.4909673" lon="8.4764904">
    <tag k="addr:city" v="Mannheim"/>
    <tag k="addr:country" v="DE"/>
    <tag k="addr:housenumber" v="5"/>
    <tag k="addr:postcode" v="68161"/>
    <tag k="addr:street" v="Collinistraße"/>
    <tag k="amenity" v="restaurant"/>
    <tag k="name" v="Churrascaria Brasil Tropical"/>
    <tag k="phone" v="+496211225596"/>
    <tag k="wheelchair" v="limited"/>
  </node>
  <node id="689928440" lat="49.4798794" lon="8.4853418">
    <tag k="amenity" v="restaurant"/>
    <tag k="cuisine" v="greek"/>
    <tag k="email" v="epirus70@hotmail.de"/>
    <tag k="fax" v="0621/4407 762"/>
    <tag k="name" v="Epirus"/>
    <tag k="opening_hours" v="Mo-Sa 12:00-15:00,18:00-24:00"/>
    <tag k="phone" v="0621/4407 761"/>
    <tag k="smoking" v="separated"/>
    <tag k="website" v="http://epirus-ma.blogspot.com/"/>
    <tag k="wheelchair" v="no"/>
  </node>
  <node id="689928445" lat="49.4799409" lon="8.4851357">
    <tag k="amenity" v="restaurant"/>
    <tag k="cuisine" v="italian"/>
    <tag k="email" v="gianlucascurti@ristorante-augusta.de"/>
    <tag k="name" v="Ristorante Augusta"/>
    <tag k="opening_hours" v="Mo-Fr 12:00-14:00,18:00-23:00;Su 12:00-14:00,18:00-23:00"/>
    <tag k="phone" v="0621 449872"/>
    <tag k="website" v="ristorante-augusta.com/"/>
    <tag k="wheelchair" v="no"/>
  </node>
</data>
XML;

$fields = array('id','name','lat','lon');
$xml = simplexml_load_string($xmlstr);

//
// PROCESS XML RECORDS
//

$poisdata = array();
$tagdata = array();

foreach ($xml->node as $node) {
    $nodedata = array_fill_keys($fields,'');
    $nodedata['id']  = intval($node['id']);
    $nodedata['lat'] = isset($node['lat']) ? floatval($node['lat']) : 0;
    $nodedata['lon'] = isset($node['lon']) ? floatval($node['lon']) : 0;
    $poisdata[] = vsprintf("(%d, %10.7f, %10.7f)", $nodedata);
    foreach ($node->tag as $tag) {
        $k = (string)$tag['k'];
        $v = (string)$tag['v'];
        $tagdata[] = sprintf("(%d, '%s', '%s')"
                , $nodedata['id']
                , $db->real_escape_string($k)
                , $db->real_escape_string($v));
    }
}

//
// STORE THE DATA
//
$sql = "REPLACE INTO pois ('id','lat','lon') VALUES\n" . join(",\n", $poisdata);
$db->query($sql);

$sql = "REPLACE INTO pois_tag (poisid, tagname, tagvalue) VALUES\n" . join(",\n", $tagdata);
$db->query($sql);

//
// DISPLAY THE DATA
//
$currentTags = array();
$sql = "SELECT DISTINCT tagname
        FROM pois_tag
        ORDER BY tagname = 'name' DESC, tagname";
$res = $db->query($sql);
while (list($tn) = $res->fetch_row()) {
    $currentTags[] = $tn;
}
$thead = "<tr><th>id</th><th>lat</th><th>lon</th><th>"
         . join('</th><th>', $currentTags) . "</th></tr>\n";
         
$currid = $currlat = $currlon = 0;
$sql = "SELECT p.id, lat, lon, tagname, tagvalue
        FROM pois p
            LEFT JOIN pois_tag t ON t.poisid = p.id
        ORDER BY p.id";
$res = $db->query($sql);
$tdata = '';
while (list($id, $lat, $lon, $t, $v) = $res->fetch_row()) {
    if ($currid != $id) {
        if ($currid) {
            $tdata .= "<tr><td>$currid</td><td>$currlat</td><td>$currlon</td><td>"
                . join('</td><td>', $poisrow) . "</td></tr>\n";
        }
        $currid = $id;
        $currlat = $lat;
        $currlon = $lon;
        $poisrow = array_fill_keys($currentTags,'');
    }
    $poisrow[$t] = $v;
}
$tdata .= "<tr><td>$currid</td><td>$currlat</td><td>$currlon</td><td>"
    . join('</td><td>', $poisrow) . "</td></tr>\n";
?>
<html>
<head>
<meta name="generator" content="PhpED 12.0 (Build 12010, 64bit)">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Tags</title>
<meta name="author" content="Barand">
<meta name="creation-date" content="06/04/2014">
<style type="text/css">
body, td, th {
    font-family: arial, sans-serif;
    font-size: 10pt;
}
table {
    border-collapse: collapse;
}
th {
    background-color: #369;
    color: white;
    padding: 5px 2px;
}
td {
    background-color: #EEE;
    padding: 2px;
}
</style>
</head>
<body>
<table border='1'>
    <?php echo $thead, $tdata; ?>
</table>
</body>

</html>

PHP Fatal error:  Call to a member function fetch_row() on a non-object in /home/martin/php/osm_200.php on line 121
martin@linux-70ce:~/php> php osm_200.php
PHP Notice:  Use of undefined constant localhost - assumed 'localhost' in /home/martin/php/osm_200.php on line 3
PHP Notice:  Use of undefined constant root - assumed 'root' in /home/martin/php/osm_200.php on line 3
PHP Notice:  Use of undefined constant rimbaud - assumed 'rimbaud' in /home/martin/php/osm_200.php on line 3
PHP Fatal error:  Call to a member function fetch_row() on a non-object in /home/martin/php/osm_200.php on line 121
martin@linux-70ce:~/php>

    require 'open-uri'
    require "net/http"
    require 'rexml/document'
     
    def query_overpass(object_type, left,bottom,right,top, key, value)
       base_url = "http://www.overpass-api.de/api/xapi?"
       query_string = "#{object_type}[bbox=#{left},#{bottom},#{right},#{top}][#{key}=#{value}]"
       url = "#{base_url}#{URI.encode(query_string)}"
       resp = Net::HTTP.get_response(URI.parse(url))
       data = resp.body
       return data
    end
     
    overpass_result = REXML::Document.new(query_overpass("node", 7.1,51.2,7.2,51.3,"amenity","restaurant|pub|ice_cream|food_court|fast_food|cafe|biergarten|bar|bakery|steak|pasta|pizza|sushi|asia|nightclub"))
     
    overpass_result.elements.each('osm/node') {|x|
      if !x.elements["tag[@k='name']"].nil?
        print x.elements["tag[@k='name']"].attributes["v"]
      end
      print " | "
     
      if !x.elements["tag[@k='addr:postcode']"].nil?
        print x.elements["tag[@k='addr:postcode']"].attributes["v"]
        print ", "
      end
      if !x.elements["tag[@k='addr:city']"].nil?
        print x.elements["tag[@k='addr:city']"].attributes["v"]
        print ", "
      end
      if !x.elements["tag[@k='addr:street']"].nil?
        print x.elements["tag[@k='addr:street']"].attributes["v"]
        print ", "
      end
      if !x.elements["tag[@k='addr:housenumber']"].nil?
        print x.elements["tag[@k='addr:housenumber']"].attributes["v"]
      end
      print " | "
      print x.attributes["lat"]
      print " | "
      print x.attributes["lon"]
      print " | "
      if !x.elements["tag[@k='website']"].nil?
        print x.elements["tag[@k='website']"].attributes["v"]
      end
      print " | "
      if !x.elements["tag[@k='amenity']"].nil?
        print x.elements["tag[@k='amenity']"].attributes["v"]
        print " | "
      end
      puts
    }