我遇到了一个我似乎无法缩小范围的问题。在 Zend Framework 应用程序中,我使用 Zend Cache 来缓存自定义Response对象中包含的潮汐和天气数据。最初创建数据时,一切正常。我序列化它并缓存它。然后当我点击刷新并从缓存中提取数据时,我收到以下错误:
消息:字符串无法解析为 XML
堆栈跟踪:
0 /home/cilosis/mysites/tidely/application/views/scripts/tides/location.phtml(38): SimpleXMLElement->__construct('')
1 /home/cilosis/mysites/tidely/library/Zend/View.php(108): include('/home/cilosis/...')
2 /home/cillosis/mysites/tidely/library/Zend/View/Abstract.php(888): Zend_View->_run('/home/cillosis/...')
...
这发生在我正在访问包含在我的自定义“响应对象”中的 XML 的视图中:
<div class="data-box">
<h3>Current Weather</h3>
<hr>
<?php
// *** THIS IS LINE 38 ***
$weather_XML = new SimpleXMLElement($this->response->_weatherdata->weatherResults);
$params = $weather_XML->data->parameters;
$img_path = $params->{'conditions-icon'}->{'icon-link'};
echo("<img src='".$img_path."'>");
...
这是第一次运行时(缓存之前)对象相关部分的转储:
["_weatherdata"]=>
object(Tidely_WeatherData)#79 (6) {
["weatherResults"]=>
string(6399) "<?xml version="1.0"?>
<dwml version="1.0" xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="http://graphical.weather.gov/xml/DWMLgen/schema/DWML.xsd">
...
</dwml> "
在您看到“...”的地方,还有很多其他 XML 数据。XML 来自 NWS(国家气象服务)API,我通过 XML 验证器运行它,它没有显示任何错误。一旦我序列化我的对象并缓存它,问题就会发生。下面是我的 Zend Cache 设置:
// Setup caching
$frontendOptions = array('lifeTime' => 30, 'automatic_seralization' => false);
$backendOptions = array('cache_dir' => '../application/cache');
$this->_cache = Zend_Cache::factory('Core', 'File', $frontendOptions, $backendOptions);
我正在用这个进行缓存和检索:
// Assign cache id
// Example query: "Chesapeake Bay Virginia"
$cache_id = 'request_results_' . $this->response->_querydata->query);
$cache_id = str_replace(' ', '_', $cache_id);
$cache_id = str_replace('-', '_', $cache_id);
// Check cache for this query
if ( ($results = $this->_cache->load($cache_id)) === false)
{
// Cache not found, process request and generate response
...
// Cache request output for specific query
$serialized_data = serialize($this->response);
$this->_cache->save($serialized_data, $cache_id);
// Return processed request results
return $this->response;
}
else
{
// Return results from cache
return unserialize($results);
}
一旦我发出请求并缓存它,$this->response
对象输出如下:
object(Tidely_ResponseData)#65 (7) { ["_querydata"]=> object(Tidely_QueryData)#66 (9) { ["query"]=> string(40) "bayou-la-batre-mississippi-sound alabama" ["source"]=> string(15) "TidesController" ["request_type"]=> string(3) "url" ["url_components"]=> array(2) { ["state"]=> string(7 )“阿拉巴马州”[“位置”]=>字符串(32)“bayou-la-batre-mississippi-sound”}[“return_type”]=>字符串(4)“JSON”[“time_range”]=>数组( 2) { ["start"]=> object(DateTime)#64 (3) { ["date"]=> string(19) "2012-04-05 18:06:51" ["timezone_type"]=> int(3) ["timezone"]=> 字符串(3) "UTC" } ["end"]=>object(DateTime)#63 (3) { ["date"]=> string(19) "2012-04-06 18:06:51" ["timezone_type"]=> int(3) ["timezone"]= > string(3) "UTC" } } ["hasError"]=> bool(false) ["userMessage"]=> NULL ["logMessage"]=> NULL } ["_locationdata"]=> object(Tidely_LocationData)# 80 (31) { ["location_id"]=> string(5) "18921" ["station_name"]=> string(33) "Bayou La Batre, Mississippi Sound" ["station_url_name"]=> string(32) " Bayou-la-batre-mississippi-sound" ["station_type"]=> string(11) "下属" ["station_id"]=> string(7) "8739051" ["station_lat"]=> string(8) " +30.3717" ["station_lon"]=> 字符串(8) "-88。2750" ["station_height_offset_high"]=> 字符串(5) "*1.23" ["station_height_offset_low"]=> 字符串(5) "*1.23" ["station_time_offset_high"]=> 字符串(3) "112" ["station_time_offset_low" ]=> 字符串(2) "74" ["station_ref_station_id"]=> 字符串(7) "8760551" ["state_id"]=> 字符串(1) "1" ["state_name"]=> 字符串(7) "阿拉巴马州" ["state_url_name"]=> 字符串(7) "阿拉巴马州" ["timezone"]=> 字符串(2) "-6" ["dst"]=> 字符串(1) "1" ["city_name"] => string(14) "Bayou La Batre" ["city_zip"]=> string(5) "36509" ["city_lat"]=> string(7) "30.4014" ["city_lon"]=>string(8) "-88.2467" ["adjacentStations"]=> string(321) "a:10:{i:8739051;d:2.6562027890531361;s:7:"TEC4393";d:8.0529290086617618;i:8740448;d :11.564338218805837; I:8735180; d:14.637787569358004; I:8741196; d:17.602722038773138; I:8734635; d:17.824002491920826; I:8733810; d:19.474837234444919; I:8737048; d:24.414028460259932; I:8742221; d:27.466706516499691 ;i:8731952;d:31.251405048051701;}" ["city_distance"]=> string(15) "2.6562027890531" ["multipleResults"]=> string(0) "" ["multipleCount"]=> int(0) [ "hasMultiple"]=> bool(false) ["showStates"]=> bool(false) ["showLocations"]=> bool(false) ["hasError"]=> bool(false) ["userMessage"]=> NULL ["logMessage"]=> NULL } ["_tidedata"]=> object(Tidely_TideData)#68 (6) { ["tideResults"]=> NULL ["queryStart"]=> NULL ["queryEnd"]=> NULL ["hasError"]=> bool(false) [" userMessage"]=> NULL ["logMessage"]=> NULL } ["_weatherdata"]=> object(Tidely_WeatherData)#79 (6) { ["weatherResults"]=> string(6399) " 气象预报 2012-04- 05T18:06:57Zhttp://graphical.weather.gov/xml/气象发展实验室产品生成处http://www.nws.noaa.gov/disclaimer.html http://www.weather.gov/ http://www.weather. gov/images/xml_logo.gif http://www.weather.gov/feedback.php point1 http://forecast.weather.gov/MapClick.php?textField1=30.37&textField2=-88.28k-p24h-n1-1 2012-04-05T08:00:00-05:00 2012-04-05T20:00:00-05:00 k-p24h-n1-2 2012-04-05T20:00:00- 05:00 2012-04-06T09:00:00-05:00 k-p3h-n5-3 2012-04-05T13:00:00-05:00 2012-04-05T16:00:00-05:00 2012 -04-05T19:00:00-05:00 2012-04-05T22:00:00-05:00 2012-04-06T01:00:00-05:00 每日最高温度 81 每日最低温度 63 温度 79 79 74 69 67 露点温度 66 65 64 64 61 风速 12 11 11 13 14 风向 240 260 280 300 330 相对湿度 64 63 71 84 81 天气类型、覆盖范围和强度条件图标http://forecast.weather.gov/ images/wtf/tsra60.jpg http://forecast.weather.gov/images/wtf/tsra60.jpg http://forecast.weather.gov/images/wtf/scttsra60.jpg http://forecast.weather.gov /images/wtf/nscttsra20.jpghttp://forecast.weather.gov/images/wtf/nsct.jpg " ["queryStart"]=> float(1333649211.6989) ["queryEnd"]=> float(1333649217.2038) ["hasError"]=> bool(false ) ["userMessage"]=> NULL ["logMessage"]=> NULL } ["hasError"]=> bool(false) ["userMessage"]=> NULL ["logMessage"]=> NULL }
当我查看源代码时,“weatherResults”部分有 XML ,我没有复制和粘贴它,因为它相当长。这是当我按下刷新并使用上述对象的缓存副本时发生的情况:
object(Tidely_ResponseData)#65 (7) { ["_querydata"]=> object(Tidely_QueryData)#66 (9) { ["query"]=> string(40) "bayou-la-batre-mississippi-sound alabama" ["source"]=> string(15) "TidesController" ["request_type"]=> string(3) "url" ["url_components"]=> array(2) { ["state"]=> string(7 )“阿拉巴马州”[“位置”]=>字符串(32)“bayou-la-batre-mississippi-sound”}[“return_type”]=>字符串(4)“JSON”[“time_range”]=>数组( 2) { ["start"]=> object(DateTime)#64 (3) { ["date"]=> string(19) "2012-04-05 18:10:30" ["timezone_type"]=> int(3) ["timezone"]=> 字符串(3) "UTC" } ["end"]=>object(DateTime)#63 (3) { ["date"]=> string(19) "2012-04-06 18:10:30" ["timezone_type"]=> int(3) ["timezone"]= > string(3) "UTC" } } ["hasError"]=> bool(false) ["userMessage"]=> NULL ["logMessage"]=> NULL } ["_locationdata"]=> object(Tidely_LocationData)# 67 (31) { ["location_id"]=> string(0) "" ["station_name"]=> string(0) "" ["station_url_name"]=> string(0) "" ["station_type"]= > string(0) "" ["station_id"]=> string(0) "" ["station_lat"]=> string(0) "" ["station_lon"]=> string(0) "" ["station_height_offset_high" ]=> 字符串(0) "" ["station_height_offset_low"]=> string(0) "" ["station_time_offset_high"]=> string(0) "" ["station_time_offset_low"]=> string(0) "" ["station_ref_station_id"]=> string(0) "" ["state_id"]=> string(0) "" ["state_name"]=> string(0) "" ["state_url_name"]=> string(0) "" ["timezone"]=> string(0) "" ["dst"]=> 字符串(0) "" ["city_name"]=> 字符串(0) "" ["city_zip"]=> 字符串(0) "" ["city_lat"]=> 字符串( 0) "" ["city_lon"]=> 字符串(0) "" ["adjacentStations"]=> 字符串(0) "" ["city_distance"]=> 字符串(0) "" ["multipleResults"]=> string(0) "" ["multipleCount"]=> int(0) ["hasMultiple"]=> bool(false) ["showStates"]=> bool(false) ["showLocations"]= > bool(false) ["hasError"]=> bool(false) ["userMessage"]=> NULL ["logMessage"]=> NULL } ["_tidedata"]=> object(Tidely_TideData)#68 (6) { ["tideResults"]=> NULL ["queryStart"]=> NULL ["queryEnd"]=> NULL ["hasError"]=> bool(false) ["userMessage"]=> NULL ["logMessage"]=> NULL } ["_weatherdata"]=> object(Tidely_WeatherData)#69 (6) { ["weatherResults"]=> NULL ["queryStart"]=> NULL ["queryEnd"]=> NULL ["hasError"]=> bool(false) ["userMessage"]=>NULL ["logMessage"]=> NULL } ["hasError"]=> bool(false) ["userMessage"]=> NULL ["logMessage"]=> NULL }
在序列化/反序列化和保存缓存的过程中,它以某种方式将所有字符串设置为空或NULL!所以当然,我收到了 XML 错误,因为它是空的。
是否有其他人在使用 Zend Cache(或任何其他缓存库)缓存对象时遇到问题?这与序列化有关吗?我缺少缓存设置吗?很抱歉解释太长,并提前感谢您的帮助!