我发现了一个非常聪明的代码,用于在给出两个参数时使用谷歌地图计算行驶时间和距离。 我正在使用它使用存储在数据库中的数据创建里程报告。
我的问题是我需要在同一个循环中使用此功能两次,但是当我这样做时,它会关闭循环并且根本不显示任何信息。
请参阅下面的功能
function get_driving_information($start, $finish, $raw = false)
{
if(strcmp($start, $finish) == 0)
{
$time = 0;
if($raw)
{
$time .= ' seconds';
}
return array('distance' => 0, 'time' => $time);
}
$start = urlencode($start);
$finish = urlencode($finish);
$distance = 'unknown';
$time = 'unknown';
$url = 'http://maps.googleapis.com/maps/api/directions/xml?origin='.$start.'&destination='.$finish.'&sensor=false';
if($data = file_get_contents($url))
{
$xml = new SimpleXMLElement($data);
if(isset($xml->route->leg->duration->value) AND (int)$xml->route->leg->duration->value > 0)
{
if($raw)
{
$distance = (string)$xml->route->leg->distance->text;
$time = (string)$xml->route->leg->duration->text;
}
else
{
$distance = (int)$xml->route->leg->distance->value / 1000 / 1.609344;
$time = (int)$xml->route->leg->duration->value/ 60;
}
}
else
{
throw new Exception('Could not find that route');
}
return array('distance' => $distance, 'time' => $time);
}
else
{
throw new Exception('Could not resolve URL');
}
}
try
{
$info = get_driving_information('fy1 4bj', 'ls1 5ns');
echo $info['distance'].' miles ' . 'That''s about ' .$info['time'].' minutes drive from you';
}
catch(Exception $e)
{
echo 'Caught exception: '.$e->getMessage()."'n";
}
这是只有在我注释掉第二个函数时才起作用的代码。
$sql="SELECT * FROM mileage";
$result=mysqli_query($con,$sql);
?><table style="width:100%" border=1px><?php
$i=0;
while($row = mysqli_fetch_array($result))
{
$i=$i+1;
if (isset($row['Start'])){$start = $row['Start'];}
if (isset($row['Site'])){$finish2 = $row['Site'];}
if (isset($lastsite)) {$finish=$lastsite;}
if (isset($start) && isset($finish)){
$info = get_driving_information($start, $finish);}
if (isset($start) && isset($finish2)){
//$info2 = get_driving_information($start, $finish2);
}
if ($i>1){
?>
<td><?php echo $start; ?></td> <td><a target="_blank" href="https://www.google.co.uk/maps/dir/<?php echo $start . "/" . $lastsite ?>">
Distance: <?php $drive=$info['distance'];
echo $drive; ?></td></tr> <?php
}?>
<tr><td> <?php echo $start ?></td><td><?php echo $finish2 ?>
</td><td><a target="_blank" href="https://www.google.co.uk/maps/dir/<?php echo $start . "/" . $finish2 ?>">
Distance:
<?php
$drive2=$info2['distance'];
echo $drive2;
?> </td></tr><tr><td> <?php echo $finish2 ?></td><?php
$lastsite=$finish2;
}?>
</table>
我并没有真正尝试修复您的代码,但一般来说它应该可以工作。下面是一个在循环中运行的PHP代码的极简示例:phpfiddle
function gdi($url){
$d=(new SimpleXMLElement(file_get_contents($url)))->route->leg;
return array('from'=>$d->start_address,'to'=>$d->end_address,
'dist'=>$d->distance->text,'dur'=>$d->duration->text);
}
$url='http://maps.googleapis.com/maps/api/directions/xml?origin=fy1+4bj&destination=';
foreach (array('ls1+5ns','Bünde','Goslar') as $dest){
$g=gdi($url.$dest);
echo "The distance from $g[from] to $g[to] is $g[dist] and driving it takes about $g[dur].'n";
}