Question

我有一个PHP脚本，它试图读取和解析从Google的Geocoder API返回的JSON字符串。该脚本适用于大多数地址，但在Google的Geocoder API返回给定地址的多个结果的几种情况下会遇到麻烦。

这是我的代码：

$mGeoFile = fopen("http://maps.googleapis.com/maps/api/geocode/json?address=" . str_replace(" ", "+", $mAddress0) . "&sensor=false", "r");       
$mGeoFileJSON = fread($mGeoFile, 10000);
fclose($mGeoFile);
$mGeocode_array = json_decode($mGeoFileJSON, true);

var_dump($mGeocode_array);
echo "<br />";
var_dump($mGeocode_array['results'][0]['geometry']['location']);

打印“115 Chestnut Street Upton，MA”（传递给$ mAddress0）：

array(2) { ["status"]=> string(2) "OK" ["results"]=> array(1) { [0]=> array(4) { ["types"]=> array(1) { [0]=> string(14) "street_address" } ["formatted_address"]=> string(37) "115 Chestnut St, Upton, MA 01568, USA" ["address_components"]=> array(8) { [0]=> array(3) { ["long_name"]=> string(3) "115" ["short_name"]=> string(3) "115" ["types"]=> array(1) { [0]=> string(13) "street_number" } } [1]=> array(3) { ["long_name"]=> string(11) "Chestnut St" ["short_name"]=> string(11) "Chestnut St" ["types"]=> array(1) { [0]=> string(5) "route" } } [2]=> array(3) { ["long_name"]=> string(5) "Upton" ["short_name"]=> string(5) "Upton" ["types"]=> array(2) { [0]=> string(8) "locality" [1]=> string(9) "political" } } [3]=> array(3) { ["long_name"]=> string(5) "Upton" ["short_name"]=> string(5) "Upton" ["types"]=> array(2) { [0]=> string(27) "administrative_area_level_3" [1]=> string(9) "political" } } [4]=> array(3) { ["long_name"]=> string(9) "Worcester" ["short_name"]=> string(9) "Worcester" ["types"]=> array(2) { [0]=> string(27) "administrative_area_level_2" [1]=> string(9) "political" } } [5]=> array(3) { ["long_name"]=> string(13) "Massachusetts" ["short_name"]=> string(2) "MA" ["types"]=> array(2) { [0]=> string(27) "administrative_area_level_1" [1]=> string(9) "political" } } [6]=> array(3) { ["long_name"]=> string(13) "United States" ["short_name"]=> string(2) "US" ["types"]=> array(2) { [0]=> string(7) "country" [1]=> string(9) "political" } } [7]=> array(3) { ["long_name"]=> string(5) "01568" ["short_name"]=> string(5) "01568" ["types"]=> array(1) { [0]=> string(11) "postal_code" } } } ["geometry"]=> array(4) { ["location"]=> array(2) { ["lat"]=> float(42.1476896) ["lng"]=> float(-71.5863099) } ["location_type"]=> string(18) "RANGE_INTERPOLATED" ["viewport"]=> array(2) { ["southwest"]=> array(2) { ["lat"]=> float(42.1445379) ["lng"]=> float(-71.5894495) } ["northeast"]=> array(2) { ["lat"]=> float(42.1508332) ["lng"]=> float(-71.5831542) } } ["bounds"]=> array(2) { ["southwest"]=> array(2) { ["lat"]=> float(42.1476815) ["lng"]=> float(-71.5863099) } ["northeast"]=> array(2) { ["lat"]=> float(42.1476896) ["lng"]=> float(-71.5862938) } } } } } } 
array(2) { ["lat"]=> float(42.1476896) ["lng"]=> float(-71.5863099) }

Geocoder还为“115 Chestnut Street Upton，MA”返回以下JSON字符串

{
  "status": "OK",
  "results": [ {
    "types": [ "street_address" ],
    "formatted_address": "115 Chestnut St, Upton, MA 01568, USA",
    "address_components": [ {
      "long_name": "115",
      "short_name": "115",
      "types": [ "street_number" ]
    }, {
      "long_name": "Chestnut St",
      "short_name": "Chestnut St",
      "types": [ "route" ]
    }, {
      "long_name": "Upton",
      "short_name": "Upton",
      "types": [ "locality", "political" ]
    }, {
      "long_name": "Upton",
      "short_name": "Upton",
      "types": [ "administrative_area_level_3", "political" ]
    }, {
      "long_name": "Worcester",
      "short_name": "Worcester",
      "types": [ "administrative_area_level_2", "political" ]
    }, {
      "long_name": "Massachusetts",
      "short_name": "MA",
      "types": [ "administrative_area_level_1", "political" ]
    }, {
      "long_name": "United States",
      "short_name": "US",
      "types": [ "country", "political" ]
    }, {
      "long_name": "01568",
      "short_name": "01568",
      "types": [ "postal_code" ]
    } ],
    "geometry": {
      "location": {
        "lat": 42.1476896,
        "lng": -71.5863099
      },
      "location_type": "RANGE_INTERPOLATED",
      "viewport": {
        "southwest": {
          "lat": 42.1445379,
          "lng": -71.5894495
        },
        "northeast": {
          "lat": 42.1508332,
          "lng": -71.5831542
        }
      },
      "bounds": {
        "southwest": {
          "lat": 42.1476815,
          "lng": -71.5863099
        },
        "northeast": {
          "lat": 42.1476896,
          "lng": -71.5862938
        }
      }
    }
  } ]
}

我遇到了谷歌地理信息系统API返回的地址，如50 Franklin Street Boston，MA的问题：

{
  "status": "OK",
  "results": [ {
    "types": [ "street_address" ],
    "formatted_address": "50 Franklin St, Boston, MA 02110, USA",
    "address_components": [ {
      "long_name": "50",
      "short_name": "50",
      "types": [ "street_number" ]
    }, {
      "long_name": "Franklin St",
      "short_name": "Franklin St",
      "types": [ "route" ]
    }, {
      "long_name": "Boston",
      "short_name": "Boston",
      "types": [ "locality", "political" ]
    }, {
      "long_name": "Boston",
      "short_name": "Boston",
      "types": [ "administrative_area_level_3", "political" ]
    }, {
      "long_name": "Suffolk",
      "short_name": "Suffolk",
      "types": [ "administrative_area_level_2", "political" ]
    }, {
      "long_name": "Massachusetts",
      "short_name": "MA",
      "types": [ "administrative_area_level_1", "political" ]
    }, {
      "long_name": "United States",
      "short_name": "US",
      "types": [ "country", "political" ]
    }, {
      "long_name": "02110",
      "short_name": "02110",
      "types": [ "postal_code" ]
    } ],
    "geometry": {
      "location": {
        "lat": 42.3556540,
        "lng": -71.0585261
      },
      "location_type": "ROOFTOP",
      "viewport": {
        "southwest": {
          "lat": 42.3525064,
          "lng": -71.0616737
        },
        "northeast": {
          "lat": 42.3588016,
          "lng": -71.0553785
        }
      }
    }
  }, {
    "types": [ "street_address" ],
    "formatted_address": "50 Franklin St, Boston, MA 02122, USA",
    "address_components": [ {
      "long_name": "50",
      "short_name": "50",
      "types": [ "street_number" ]
    }, {
      "long_name": "Franklin St",
      "short_name": "Franklin St",
      "types": [ "route" ]
    }, {
      "long_name": "Boston",
      "short_name": "Boston",
      "types": [ "locality", "political" ]
    }, {
      "long_name": "Boston",
      "short_name": "Boston",
      "types": [ "administrative_area_level_3", "political" ]
    }, {
      "long_name": "Suffolk",
      "short_name": "Suffolk",
      "types": [ "administrative_area_level_2", "political" ]
    }, {
      "long_name": "Massachusetts",
      "short_name": "MA",
      "types": [ "administrative_area_level_1", "political" ]
    }, {
      "long_name": "United States",
      "short_name": "US",
      "types": [ "country", "political" ]
    }, {
      "long_name": "02122",
      "short_name": "02122",
      "types": [ "postal_code" ]
    } ],
    "geometry": {
      "location": {
        "lat": 42.2871370,
        "lng": -71.0400105
      },
      "location_type": "ROOFTOP",
      "viewport": {
        "southwest": {
          "lat": 42.2839894,
          "lng": -71.0431581
        },
        "northeast": {
          "lat": 42.2902846,
          "lng": -71.0368629
        }
      }
    }
  }, {
    "types": [ "street_address" ],
    "formatted_address": "50 Franklin St, Boston, MA 02129, USA",
    "address_components": [ {
      "long_name": "50",
      "short_name": "50",
      "types": [ "street_number" ]
    }, {
      "long_name": "Franklin St",
      "short_name": "Franklin St",
      "types": [ "route" ]
    }, {
      "long_name": "Boston",
      "short_name": "Boston",
      "types": [ "locality", "political" ]
    }, {
      "long_name": "Boston",
      "short_name": "Boston",
      "types": [ "administrative_area_level_3", "political" ]
    }, {
      "long_name": "Suffolk",
      "short_name": "Suffolk",
      "types": [ "administrative_area_level_2", "political" ]
    }, {
      "long_name": "Massachusetts",
      "short_name": "MA",
      "types": [ "administrative_area_level_1", "political" ]
    }, {
      "long_name": "United States",
      "short_name": "US",
      "types": [ "country", "political" ]
    }, {
      "long_name": "02129",
      "short_name": "02129",
      "types": [ "postal_code" ]
    } ],
    "geometry": {
      "location": {
        "lat": 42.3785674,
        "lng": -71.0668132
      },
      "location_type": "RANGE_INTERPOLATED",
      "viewport": {
        "southwest": {
          "lat": 42.3754150,
          "lng": -71.0699535
        },
        "northeast": {
          "lat": 42.3817103,
          "lng": -71.0636583
        }
      },
      "bounds": {
        "southwest": {
          "lat": 42.3785579,
          "lng": -71.0668132
        },
        "northeast": {
          "lat": 42.3785674,
          "lng": -71.0667986
        }
      }
    }
  }, {
    "types": [ "street_address" ],
    "formatted_address": "50 Franklin St, Boston, MA 02136, USA",
    "address_components": [ {
      "long_name": "50",
      "short_name": "50",
      "types": [ "street_number" ]
    }, {
      "long_name": "Franklin St",
      "short_name": "Franklin St",
      "types": [ "route" ]
    }, {
      "long_name": "Boston",
      "short_name": "Boston",
      "types": [ "locality", "political" ]
    }, {
      "long_name": "Boston",
      "short_name": "Boston",
      "types": [ "administrative_area_level_3", "political" ]
    }, {
      "long_name": "Suffolk",
      "short_name": "Suffolk",
      "types": [ "administrative_area_level_2", "political" ]
    }, {
      "long_name": "Massachusetts",
      "short_name": "MA",
      "types": [ "administrative_area_level_1", "political" ]
    }, {
      "long_name": "United States",
      "short_name": "US",
      "types": [ "country", "political" ]
    }, {
      "long_name": "02136",
      "short_name": "02136",
      "types": [ "postal_code" ]
    } ],
    "geometry": {
      "location": {
        "lat": 42.2526044,
        "lng": -71.1332635
      },
      "location_type": "RANGE_INTERPOLATED",
      "viewport": {
        "southwest": {
          "lat": 42.2494625,
          "lng": -71.1364052
        },
        "northeast": {
          "lat": 42.2557577,
          "lng": -71.1301100
        }
      },
      "bounds": {
        "southwest": {
          "lat": 42.2526044,
          "lng": -71.1332635
        },
        "northeast": {
          "lat": 42.2526158,
          "lng": -71.1332517
        }
      }
    },
    "partial_match": true
  } ]
}

我的脚本返回：

NULL 
NULL

任何想法可能会发生什么？谢谢！

Answer 1

响应很可能超过10k个字符，在这种情况下，您尝试解码无效的JSON字符串。确保在解码之前读取整个流。最简单的方法是使用file_get_contents而不是fopen / fread / fclose。从长远来看，你应该转向卷曲。

Answer 2

对我来说，你的字符串被完美解码。也许响应是以UTF-8编码并且在字符串中存在B.O.M（字节顺序标记）字符。在这种情况下，字符串不是正确的JSON格式结构（请参阅RFC 4627）。

在他的位置，我会写几行，看看这是不是问题。你可以剥离B.O.M characteres包装CCC inna bynary string。递归调用此函数：

function removeBOM($str=""){
        if(substr($str, 0,3) == pack("CCC",0xef,0xbb,0xbf)) {
                $str=substr($str, 3);
        }
        return $str;
}

如果Geocoder返回多个结果，则PHP脚本无法解析Google Maps Geocoder API返回的JSON

2 个答案: