PHP / XML帮助谷歌商店定位器教程

Question

嗯，基本上我对PHP比较陌生，我一直在尝试教程（见下面的链接），我一直在收到错误，我用Google搜索但似乎没有任何效果：S

我使用Chrome获得的错误是：     此页面包含以下错误：     第3行第1行的错误：xmlParsePI：没有目标名称     下面是第一个错误的页面呈现。

教程：https://developers.google.com/maps/articles/phpsqlsearch_v3

这是代码：

<?php
require("phpsqlsearch_dbinfo.php");

// Get parameters from URL
// Get parameters from URL
$center_lat = ( isset( $_GET["lat"] ) ? $_GET["lat"] : 37 ); 
$center_lng = ( isset( $_GET["lng"] ) ? $_GET["lng"] : 122 ); 
$radius     = ( isset( $_GET["radius"] ) ? $_GET["radius"] : 25 );

// Start XML file, create parent node
$dom = new DOMDocument("1.0");
$node = $dom->createElement("markers");
$parnode = $dom->appendChild($node);

// Opens a connection to a mySQL server
$connection=mysql_connect ('localhost', 'root', '');
if (!$connection) {
  die("Not connected : " . mysql_error());

}

// Set the active mySQL database
$db_selected = mysql_select_db('test', $connection);
if (!$db_selected) {
  die ("Can\'t use db : " . mysql_error());
}

// Search the rows in the markers table
$query = sprintf("SELECT address, name, lat, lng, ( 3959 * acos( cos( radians('%s') ) * cos( radians( lat ) ) * cos( radians( lng ) - radians('%s') ) + sin( radians('%s') ) * sin( radians( lat ) ) ) ) AS distance FROM markers HAVING distance < '%s' ORDER BY distance LIMIT 0 , 20",
  mysql_real_escape_string($center_lat),
  mysql_real_escape_string($center_lng),
  mysql_real_escape_string($center_lat),
  mysql_real_escape_string($radius));
$result = mysql_query($query);

if (!$result) {
  die("Invalid query: " . mysql_error());
}

header("Content-type: text/xml");

// Iterate through the rows, adding XML nodes for each
while ($row = @mysql_fetch_assoc($result)){
  $node = $dom->createElement("marker");
  $newnode = $parnode->appendChild($node);
  $newnode->setAttribute("name", $row['name']);
  $newnode->setAttribute("address", $row['address']);
  $newnode->setAttribute("lat", $row['lat']);
  $newnode->setAttribute("lng", $row['lng']);
  $newnode->setAttribute("distance", $row['distance']);
}

echo $dom->saveXML();
?>

有人可以帮忙吗？

Answer 1

从教程中，经度坐标为负值

  

Frankie Johnnie＆amp; Luigo Too，“939 W El Camino Real，Mountain View，   CA”，37.386339，-122.085823

在您的代码中，默认值的经度坐标为正。

更改

$center_lng = ( isset( $_GET["lng"] ) ? $_GET["lng"] : 122 ); 

到

 $center_lng = ( isset( $_GET["lng"] ) ? $_GET["lng"] : -122 ); 

我测试了修正后的代码并生成了xml。

这是我的完整代码

<?php
require("dbinfo.php");

// Get parameters from URL
$center_lat = ( isset( $_GET["lat"] ) ? $_GET["lat"] : 37 ); 
$center_lng = ( isset( $_GET["lng"] ) ? $_GET["lng"] : -122 ); 
$radius     = ( isset( $_GET["radius"] ) ? $_GET["radius"] : 25 );

// Start XML file, create parent node
$dom = new DOMDocument("1.0");
$node = $dom->createElement("markers");
$parnode = $dom->appendChild($node);

// Opens a connection to a mySQL server
$connection=mysql_connect ($host, $username, $password);
if (!$connection) {
  die("Not connected : " . mysql_error());

}

// Set the active mySQL database
$db_selected = mysql_select_db($database, $connection);
if (!$db_selected) {
  die ("Can\'t use db : " . mysql_error());
}

// Search the rows in the markers table
$query = sprintf("SELECT address, name, lat, lng, ( 3959 * acos( cos( radians('%s') ) * cos( radians( lat ) ) * cos( radians( lng ) - radians('%s') ) + sin( radians('%s') ) * sin( radians( lat ) ) ) ) AS distance FROM markers HAVING distance < '%s' ORDER BY distance LIMIT 0 , 20",
  mysql_real_escape_string($center_lat),
  mysql_real_escape_string($center_lng),
  mysql_real_escape_string($center_lat),
  mysql_real_escape_string($radius));
$result = mysql_query($query);

if (!$result) {
  die("Invalid query: " . mysql_error());
}

header("Content-type: text/xml");

// Iterate through the rows, adding XML nodes for each
while ($row = @mysql_fetch_assoc($result)){
  $node = $dom->createElement("marker");
  $newnode = $parnode->appendChild($node);
  $newnode->setAttribute("name", $row['name']);
  $newnode->setAttribute("address", $row['address']);
  $newnode->setAttribute("lat", $row['lat']);
  $newnode->setAttribute("lng", $row['lng']);
  $newnode->setAttribute("distance", $row['distance']);
}

echo $dom->saveXML();
?>

这是结果的图像