由于您想使用数据库，因此可以找到正确的示例Here。此示例的问题是它使用已弃用的mysql_函数。下面的代码使用PDO代替这些mysql_函数phpsqlsearch_genxml.php
//Connect to database
$dbh = new PDO("mysql:host=$host;dbname=$database", $username, $password);
$dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
try {
// Prepare statement
$stmt = $dbh->prepare("SELECT name, lat, lng, (3959 * acos(cos(radians(?)) * cos(radians(lat)) * cos(radians(lng) - radians(?)) + sin(radians(?)) * sin(radians(lat)))) AS distance FROM table HAVING distance < ? ORDER BY distance LIMIT 0 , 20");
// Assign parameters
$stmt->bindParam(1,$center_lat);
$stmt->bindParam(2,$center_lng);
$stmt->bindParam(3,$center_lat);
$stmt->bindParam(4,$radius);
//Execute query
$stmt->setFetchMode(PDO::FETCH_ASSOC);
$stmt->execute();
header("Content-type: text/xml");
// Iterate through the rows, adding XML nodes for each
while($row = $stmt->fetch()) {
$node = $dom->createElement("marker");
$newnode = $parnode->appendChild($node);
$newnode->setAttribute("name", $row['name']);
$newnode->setAttribute("lat", $row['lat']);
$newnode->setAttribute("lng", $row['lng']);
$newnode->setAttribute("distance", $row['distance']);
}
echo $dom->saveXML();
}
catch(PDOException $e) {
echo "I'm sorry I'm afraid you can't do that.". $e->getMessage() ;// Remove or modify after testing
file_put_contents('PDOErrors.txt',date('[Y-m-d H:i:s]').", phpsqlsearch_genxml.php, ". $e->getMessage()."\r\n", FILE_APPEND);
}
//Close the connection
$dbh = null;