<?php
// Connecting, selecting database
$dbconn = pg_connect("host=localhost  port=5432 dbname=routing user=postgres password=p8dx2780")
    or die('Could not connect: ' . pg_last_error());

// Performing SQL query
//$query = 'SELECT st_asgeojson(st_union(the_geom)) FROM export';
//$result = pg_query($query) or die('Query failed: ' . pg_last_error());
$x = $_GET["x"];
$y = $_GET["y"];

$sql = 'SELECT ST_AsGeoJSON(v.the_geom)
FROM (SELECT ST_SetSRID(ST_Point('.$y.','.$x.'),
900913) As the_geom) As b LEFT JOIN vertices_tmp As v
ON ST_DWithin(v.the_geom, b.the_geom, 10000)
ORDER BY ST_Distance(v.the_geom, b.the_geom)
LIMIT 1;'

$result = pg_query($sql) or die ('Query failed: ' . pg_last_error());

// Printing results in HTML
/*echo "<table>\n";
while ($line = pg_fetch_array($result, null, PGSQL_ASSOC)) {
    echo "\t<tr>\n";
    foreach ($line as $col_value) {
        echo "\t\t<td>$col_value</td>\n";
    }
    echo "\t</tr>\n";
}
echo "</table>\n";*/

while ($line = pg_fetch_array($result, null, PGSQL_ASSOC)) {
    foreach ($line as $col_value) {
        echo "$col_value";
    }
};

// Free resultset
pg_free_result($result);

// Closing connection
pg_close($dbconn);
?>