CODEWITHSUNDEEP
php
compcobalt
compcobalt

Reputation: 1362

SimpleXML Error Handling

I'm loading a simpleXML url like so:

$City_and_State = "Miami,FL"

    $url="https://www.google.com/ig/api?weather=$City_and_State&hl=en&referrer=googlecalendar";
    $xml = simplexml_load_file($url);

and the data I get back is:

<?xml version="1.0"?>
<xml_api_reply version="1">
  <weather section="0" row="0" mobile_zipped="1" mobile_row="0" tab_id="0" module_id="0">
    <forecast_information>
      <city data="Miami, FL"/>
      <postal_code data="Miami,FL"/>
      <latitude_e6 data=""/><longitude_e6 data=""/>
      <forecast_date data="2013-08-26"/>
      <current_date_time data="1970-01-01 00:00:00 +0000"/>
      <unit_system data="US"/>
    </forecast_information>
    <current_conditions>
      <condition data="Mostly Cloudy"/>
      <temp_f data="86"/><temp_c data="30"/>
      <humidity data="Humidity: 76%"/>
      <icon data="/ig/images/weather/mostly_cloudy.gif"/>
      <wind_condition data="Wind: NE at 0 mph"/>
    </current_conditions>
    <forecast_conditions>
      <day_of_week data="Mon"/>
      <low data="77"/>
      <high data="93"/>
      <icon data="/ig/images/weather/thunderstorm.gif"/>
      <condition data="Thunderstorm"/>
    </forecast_conditions>
    <forecast_conditions>
      <day_of_week data="Tue"/>
      <low data="77"/>
      <high data="93"/>
      <icon data="/ig/images/weather/chance_of_storm.gif"/>
      <condition data="Chance of Storm"/>
    </forecast_conditions>
    <forecast_conditions>
      <day_of_week data="Wed"/>
      <low data="77"/>
      <high data="93"/>
      <icon data="/ig/images/weather/chance_of_storm.gif"/>
      <condition data="Chance of Storm"/>
    </forecast_conditions>
    <forecast_conditions>
      <day_of_week data="Thu"/>
      <low data="79"/>
      <high data="93"/>
      <icon data="/ig/images/weather/chance_of_storm.gif"/>
      <condition data="Chance of Storm"/>
    </forecast_conditions>
  </weather>
</xml_api_reply>

now if the $City_and_State = "Bablablablalba"

then this is what I get:

<?xml version="1.0"?>
<xml_api_reply version="1">
  <weather section="0" row="0" mobile_zipped="1" mobile_row="0" tab_id="0" module_id="0">
    <problem_cause data=""/>
  </weather>
</xml_api_reply>

So the first one has the weather data and the 2nd one does not.

How can I check if the weather data exists ? (maybe check if the element exists or child or something like this ?)

I tried the following but it doesn't work.

if( $xml->weather->current_conditions->condition->attributes()->data  != '' ) {
 echo 'Weather Data Exists';
 } else {
 echo 'Weather Data Does NOT Exists';
 }

Upvotes: 3

Views: 150

Answers (1)

Mike Brant
Mike Brant

Reputation: 71384

I would just look for existence of $xml->weather->problem_cause as this seems to only appear in the bad XML.

if (isset($xml->weather->problem_cause)) {
    // you have a problem
} else {
    // you received data
}

Alternately, you might look for the presence of $xml->weather->forecast_information as a positive assertion that the data exists.

Upvotes: 7

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