使用Google Maps Api（JSON）获取两个位置之间的距离

Question

I want to get the distance between two locations using the Google API however this is the first time I hear about JSON and actually see its format. 我想使用Google API来获取两个位置之间的距离，但这是我第一次听说JSON并真正看到其格式。 The variable $json_a should decode the JSON but when I try to get the distance I get "Notice: Undefined index: legs in C:\\xampp\\htdocs\\app2\\test.php on line 24". 变量$ json_a应该解码JSON，但是当我尝试获取距离时，我得到“注意：未定义的索引：第24行的C：\\ xampp \\ htdocs \\ app2 \\ test.php中的腿”。 I added a link so you can see how the JSON structure looks like. 我添加了一个链接，以便您可以看到JSON结构的样子。 I'll also want these locations ordered by distance and if you can provide any tips about how I could do that it would be great. 我还希望这些位置按距离排序，如果您能提供有关如何操作的提示，那将是很好的。 Thanks! 谢谢！ :) :)

PS: I know MySQL is depreciated, I'll look into MySQLi or PDO ASAP. PS：我知道MySQL已过时，我将尽快研究MySQLi或PDO。

//$origin = $_COOKIE['origin'];
//$id=$_GET['id'];

$origin = "Bucuresti+Avrig+30";
$id = 3;
$query = ("SELECT * FROM locations WHERE category_id='$id'");
$result = mysql_query($query) or die (mysql_error());
while($row = mysql_fetch_array($result))
{
$address = $row['Judet'] . '+' . $row['Localitate'] . '+' . $row['Strada'] . '+' . $row['Numar'];
$address = str_replace(' ', '+', $address);

$fullurl = 'http://maps.googleapis.com/maps/api/directions/json?origin=' . $origin . '&destination=' . $address .  '&alternatives=true&sensor=true';
$json_a = json_decode((file_get_contents($fullurl)),true); 

echo $row['name'];
echo "<span class='badge'>" . $json_a['legs']['routes']['distance']['text'] . "</span></button>";
}

http://maps.googleapis.com/maps/api/directions/json?origin=Comanesti+Dimitrie+Ghica+13&destination=Brasov+1+Mai&alternatives=true&sensor=true http://maps.googleapis.com/maps/api/directions/json?origin=Comanesti+Dimitrie+Ghica+13&destination=Brasov+1+Mai&alternatives=true&sensor=true

print_r shows me this: print_r向我展示了这一点：

Answer 1

For finding the first value of routes, you can use below code :- 要查找路线的第一个值，可以使用以下代码：-

$json_a['routes'][0]['legs'][0]['distance']['text']

If you want to show all values then use foreach . 如果要显示所有值，请使用foreach 。

For sorting on values 用于按值排序

function cmp($a, $b)
{
    if ($a == $b) {
        return 0;
    }
    return ($a < $b) ? -1 : 1;
}

$a = array(3, 2, 5, 6, 1);

usort($a, "cmp");

foreach ($a as $key => $value) {
    echo "$key: $value\n";
}

使用Google Maps Api（JSON）获取两个位置之间的距离

问题描述

1 个解决方案

解决方案1
0 已采纳 2015-01-31 09:49:13

使用Google Maps Api（JSON）获取两个位置之间的距离

问题描述

1 个解决方案

解决方案1 0 已采纳 2015-01-31 09:49:13

解决方案1
0 已采纳 2015-01-31 09:49:13