Question

我编写了一个具有以下代码的函数文件：

<?php

  function get_lat_long_from_address($address)
  {

    $prepAddr = str_replace(' ','+',$address); 
    $geocode=file_get_contents('http://maps.google.com/maps/api/geocode/json?address='.$prepAddr.'&sensor=false'); 
    $output= json_decode($geocode);

    $lat = $output->results[0]->geometry->location->lat;
    $long = $output->results[0]->geometry->location->lng;

    return array($lat,$long);
  }

  //function get_closest_disco($client_adress)
  //{
    include ('connection.php');

    $num_discos = get_num_discos();
    $client_address = "C/ Sant Pere, 69, Barcelona";
    list($client_lat,$client_long) = get_lat_long_from_address($client_address);
    echo $client_address.'<br>Lat: '.$client_lat.'<br>Long: '.$client_long;
    $query = 'SELECT adress FROM disco';
    $result = mysql_query($query,$connect);

    while ($row = mysql_fetch_row($result))
    {
        $disco_address[] = $row;        
    }

    for ($i = 0; $i<count($disco_address); $i++)
    {
        $all_disco_address[] = implode(',', $disco_address[$i]);        
    }
    echo '<br>';
    var_dump($disco_address);
    echo '<br>';
    print_r($disco_address);

    for ($i = 0; $i<count($disco_address); $i++)
    {
        list($disco_lat,$disco_long) = get_lat_long_from_address($disco_address[$i][0]);
        /*$d = acos(sin($client_lat)*sin($disco_lat) + 
                  cos($client_lat)*cos($disco_lat) *
                  cos($client_long-$disco_long)) * 6371000;*/
        echo $all_disco_address[$i].'<br>Lat: '.$disco_lat.'<br>Long: '.$disco_long;

    }
 // }


?>

我想从我存储在数据库中的地址计算纬度和经度。然后我进行查询，并将结果存储在var $ disco_address []中。最后，我使用函数get_lat_long_from_address（$ address）从这些地址获取纬度和经度。问题是，我可以从查询的第一个结果得到lat＆amp; long，但不能用于以下那些...这是我得到的输出：

C/ Sant Pere, 69, Barcelona
Lat: 41.4451768
Long: 2.2451514
array(4) { [0]=> array(1) { [0]=> string(35) "C/ Nou de la Rambla, 113, Barcelona" } [1]=> array(1) { [0]=> string(29) "C/ Almogàvers, 122, Barcelona" } [2]=> array(1) { [0]=> string(22) "C/ A sobre de l'Api, 1" } [3]=> array(1) { [0]=> string(27) "C/ Serra i Moret, 6, Mataró" } } 
Array ( [0] => Array ( [0] => C/ Nou de la Rambla, 113, Barcelona ) [1] => Array ( [0] => C/ Almogàvers, 122, Barcelona ) [2] => Array ( [0] => C/ A sobre de l'Api, 1 ) [3] => Array ( [0] => C/ Serra i Moret, 6, Mataró ) ) C/ Nou de la Rambla, 113, Barcelona
Lat: 41.3743451
Long: 2.1694939
Notice: Undefined offset: 0 in C:\xampp\htdocs\test\functions.php on line 33

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Notice: Trying to get property of non-object in C:\xampp\htdocs\test\functions.php on line 33

Notice: Trying to get property of non-object in C:\xampp\htdocs\test\functions.php on line 33

Notice: Undefined offset: 0 in C:\xampp\htdocs\test\functions.php on line 34

Notice: Trying to get property of non-object in C:\xampp\htdocs\test\functions.php on line 34

Notice: Trying to get property of non-object in C:\xampp\htdocs\test\functions.php on line 34

Notice: Trying to get property of non-object in C:\xampp\htdocs\test\functions.php on line 34
C/ Almogàvers, 122, Barcelona
Lat: 
Long: 
Notice: Undefined offset: 0 in C:\xampp\htdocs\test\functions.php on line 33

Notice: Trying to get property of non-object in C:\xampp\htdocs\test\functions.php on line 33

Notice: Trying to get property of non-object in C:\xampp\htdocs\test\functions.php on line 33

Notice: Trying to get property of non-object in C:\xampp\htdocs\test\functions.php on line 33

Notice: Undefined offset: 0 in C:\xampp\htdocs\test\functions.php on line 34

Notice: Trying to get property of non-object in C:\xampp\htdocs\test\functions.php on line 34

Notice: Trying to get property of non-object in C:\xampp\htdocs\test\functions.php on line 34

Notice: Trying to get property of non-object in C:\xampp\htdocs\test\functions.php on line 34
C/ A sobre de l'Api, 1
Lat: 
Long: 
Notice: Undefined offset: 0 in C:\xampp\htdocs\test\functions.php on line 33

Notice: Trying to get property of non-object in C:\xampp\htdocs\test\functions.php on line 33

Notice: Trying to get property of non-object in C:\xampp\htdocs\test\functions.php on line 33

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Notice: Undefined offset: 0 in C:\xampp\htdocs\test\functions.php on line 34

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C/ Serra i Moret, 6, Mataró
Lat: 
Long:

看起来最后一个foor循环的第二次迭代有一个错误，带有函数get_lat_long_from_address（$ address）的偏移量，但我不知道为什么。我很感激任何帮助。谢谢。

Answer 1

问题出在这里

$lat = $output->results[0]->geometry->location->lat;
$long = $output->results[0]->geometry->location->lng;

你必须像这样检查$output->status：

if ($output->status == "OK") {
    $lat = $output->results[0]->geometry->location->lat;
    $long = $output->results[0]->geometry->location->lng;
    return array($lat,$long);
} else {
    return array("error", $output->status);
}

并将其更改为：

list($client_lat,$client_long) = get_lat_long_from_address($client_address);
if ($client_lat == "error") {
    echo "status error: " . $client_long;
    exit;
}

Answer 2

我想第33行和错误是$lat = $output->results[0]。

在var_dump($output)后尝试$output= json_decode($geocode); jus查看从gmaps API返回的数据

无论如何，我试图以这种方式模仿您的代码：

$s = urlencode('C/ Sant Pere, 69, Barcelona');

$j = file_get_contents('http://maps.google.com/maps/api/geocode/json?address='.$s.'&sensor=false');
$j = json_decode($j);

var_dump($j->results[0]);

我得到了正确的json结果，所以也许你需要在这里提供更多细节

Answer 3

我终于找到了原因。是一个地址问题。看起来json_decode不接受带重音的地址。我的数据库中的一些地址有像：Mataró，Almogàvers。哦，而且我的lenguage（加泰罗尼亚语）中街道的缩减根本不起作用（“C /”表示“Carrer”，只在某些情况下有效）。

php函数在第二次迭代时不起作用

3 个答案: