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How can I assign SimpleXMLElements to variables?

Posted on 2016-11-12
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Last Modified: 2016-11-19
How can I assign SimpleXMLElements to variables?

The following PHP 5.3 code:
#!/usr/local/bin/php
<?php // demo/temp_it_architect.php
/**
 * https://www.experts-exchange.com/questions/28982054/PHP-code-to-retrieve-NDFD-weather-forecasts.html
 *
 * https://www.experts-exchange.com/articles/12239/Introduction-to-Application-Programming-Interfaces.html
 */
error_reporting(E_ALL);

$url = <<<EOD
http://graphical.weather.gov/xml/sample_products/browser_interface/ndfdBrowserClientByDay.php?whichClient=NDFDgenByDay&lat=42.8808333&lon=-85.5228056&listLatLon=&lat1=&lon1=&lat2=&lon2=&resolutionSub=&endPoint1Lat=&endPoint1Lon=&endPoint2Lat=&endPoint2Lon=&centerPointLat=&centerPointLon=&distanceLat=&distanceLon=&resolutionSquare=&zipCodeList=&citiesLevel=&format=24+hourly&startDate=2016-11-12&numDays=7&Unit=e&Submit=Submit
EOD;

// SHOW HOW TO RETRIEVE DATA FROM THE API
$xml = file_get_contents($url);
$obj = SimpleXML_Load_String($xml);
echo '<pre>';
var_dump($obj);

Open in new window

returns weather information that looks like this:
object(SimpleXMLElement)#1 (3) {
  ["@attributes"]=>
  array(1) {
    ["version"]=>
    string(3) "1.0"
  }
  ["head"]=>
  object(SimpleXMLElement)#2 (2) {
    ["product"]=>
    object(SimpleXMLElement)#4 (5) {
      ["@attributes"]=>
      array(3) {
        ["srsName"]=>
        string(8) "WGS 1984"
        ["concise-name"]=>
        string(9) "dwmlByDay"
        ["operational-mode"]=>
        string(8) "official"
      }
      ["title"]=>
      string(58) "NOAA's National Weather Service Forecast by 24 Hour Period"
      ["field"]=>
      string(14) "meteorological"
      ["category"]=>
      string(8) "forecast"
      ["creation-date"]=>
      string(20) "2016-11-13T01:30:38Z"
    }
    ["source"]=>
    object(SimpleXMLElement)#5 (6) {
      ["more-information"]=>
      string(38) "http://www.nws.noaa.gov/forecasts/xml/"
      ["production-center"]=>
      string(37) "Meteorological Development Laboratory"
      ["disclaimer"]=>
      string(39) "http://www.nws.noaa.gov/disclaimer.html"
      ["credit"]=>
      string(23) "http://www.weather.gov/"
      ["credit-logo"]=>
      string(42) "http://www.weather.gov/images/xml_logo.gif"
      ["feedback"]=>
      string(35) "http://www.weather.gov/feedback.php"
    }
  }
  ["data"]=>
  object(SimpleXMLElement)#3 (4) {
    ["location"]=>
    object(SimpleXMLElement)#5 (2) {
      ["location-key"]=>
      string(6) "point1"
      ["point"]=>
      object(SimpleXMLElement)#9 (1) {
        ["@attributes"]=>
        array(2) {
          ["latitude"]=>
          string(5) "42.88"
          ["longitude"]=>
          string(6) "-85.52"
        }
      }
    }
    ["moreWeatherInformation"]=>
    string(75) "http://forecast.weather.gov/MapClick.php?textField1=42.88&textField2=-85.52"
    ["time-layout"]=>
    array(3) {
      [0]=>
      object(SimpleXMLElement)#4 (4) {
        ["@attributes"]=>
        array(2) {
          ["time-coordinate"]=>
          string(5) "local"
          ["summarization"]=>
          string(8) "24hourly"
        }
        ["layout-key"]=>
        string(11) "k-p24h-n7-1"
        ["start-valid-time"]=>
        array(7) {
          [0]=>
          string(25) "2016-11-13T06:00:00-05:00"
          [1]=>
          string(25) "2016-11-14T06:00:00-05:00"
          [2]=>
          string(25) "2016-11-15T06:00:00-05:00"
          [3]=>
          string(25) "2016-11-16T06:00:00-05:00"
          [4]=>
          string(25) "2016-11-17T06:00:00-05:00"
          [5]=>
          string(25) "2016-11-18T06:00:00-05:00"
          [6]=>
          string(25) "2016-11-19T06:00:00-05:00"
        }
        ["end-valid-time"]=>
        array(7) {
          [0]=>
          string(25) "2016-11-14T06:00:00-05:00"
          [1]=>
          string(25) "2016-11-15T06:00:00-05:00"
          [2]=>
          string(25) "2016-11-16T06:00:00-05:00"
          [3]=>
          string(25) "2016-11-17T06:00:00-05:00"
          [4]=>
          string(25) "2016-11-18T06:00:00-05:00"
          [5]=>
          string(25) "2016-11-19T06:00:00-05:00"
          [6]=>
          string(25) "2016-11-20T06:00:00-05:00"
        }
      }
      [1]=>
      object(SimpleXMLElement)#6 (4) {
        ["@attributes"]=>
        array(2) {
          ["time-coordinate"]=>
          string(5) "local"
          ["summarization"]=>
          string(8) "12hourly"
        }
        ["layout-key"]=>
        string(12) "k-p12h-n14-2"
        ["start-valid-time"]=>
        array(14) {
          [0]=>
          string(25) "2016-11-12T18:00:00-05:00"
          [1]=>
          string(25) "2016-11-13T06:00:00-05:00"
          [2]=>
          string(25) "2016-11-13T18:00:00-05:00"
          [3]=>
          string(25) "2016-11-14T06:00:00-05:00"
          [4]=>
          string(25) "2016-11-14T18:00:00-05:00"
          [5]=>
          string(25) "2016-11-15T06:00:00-05:00"
          [6]=>
          string(25) "2016-11-15T18:00:00-05:00"
          [7]=>
          string(25) "2016-11-16T06:00:00-05:00"
          [8]=>
          string(25) "2016-11-16T18:00:00-05:00"
          [9]=>
          string(25) "2016-11-17T06:00:00-05:00"
          [10]=>
          string(25) "2016-11-17T18:00:00-05:00"
          [11]=>
          string(25) "2016-11-18T06:00:00-05:00"
          [12]=>
          string(25) "2016-11-18T18:00:00-05:00"
          [13]=>
          string(25) "2016-11-19T06:00:00-05:00"
        }
        ["end-valid-time"]=>
        array(14) {
          [0]=>
          string(25) "2016-11-13T06:00:00-05:00"
          [1]=>
          string(25) "2016-11-13T18:00:00-05:00"
          [2]=>
          string(25) "2016-11-14T06:00:00-05:00"
          [3]=>
          string(25) "2016-11-14T18:00:00-05:00"
          [4]=>
          string(25) "2016-11-15T06:00:00-05:00"
          [5]=>
          string(25) "2016-11-15T18:00:00-05:00"
          [6]=>
          string(25) "2016-11-16T06:00:00-05:00"
          [7]=>
          string(25) "2016-11-16T18:00:00-05:00"
          [8]=>
          string(25) "2016-11-17T06:00:00-05:00"
          [9]=>
          string(25) "2016-11-17T18:00:00-05:00"
          [10]=>
          string(25) "2016-11-18T06:00:00-05:00"
          [11]=>
          string(25) "2016-11-18T18:00:00-05:00"
          [12]=>
          string(25) "2016-11-19T06:00:00-05:00"
          [13]=>
          string(25) "2016-11-19T18:00:00-05:00"
        }
      }
      [2]=>
      object(SimpleXMLElement)#7 (4) {
        ["@attributes"]=>
        array(2) {
          ["time-coordinate"]=>
          string(5) "local"
          ["summarization"]=>
          string(8) "24hourly"
        }
        ["layout-key"]=>
        string(10) "k-p7d-n1-3"
        ["start-valid-time"]=>
        string(25) "2016-11-13T06:00:00-05:00"
        ["end-valid-time"]=>
        string(25) "2016-11-20T06:00:00-05:00"
      }
    }
    ["parameters"]=>
    object(SimpleXMLElement)#8 (6) {
      ["@attributes"]=>
      array(1) {
        ["applicable-location"]=>
        string(6) "point1"
      }
      ["temperature"]=>
      array(2) {
        [0]=>
        object(SimpleXMLElement)#9 (3) {
          ["@attributes"]=>
          array(3) {
            ["type"]=>
            string(7) "maximum"
            ["units"]=>
            string(10) "Fahrenheit"
            ["time-layout"]=>
            string(11) "k-p24h-n7-1"
          }
          ["name"]=>
          string(25) "Daily Maximum Temperature"
          ["value"]=>
          array(7) {
            [0]=>
            string(2) "55"
            [1]=>
            string(2) "56"
            [2]=>
            string(2) "55"
            [3]=>
            string(2) "56"
            [4]=>
            string(2) "59"
            [5]=>
            string(2) "59"
            [6]=>
            object(SimpleXMLElement)#15 (0) {
            }
          }
        }
        [1]=>
        object(SimpleXMLElement)#10 (3) {
          ["@attributes"]=>
          array(3) {
            ["type"]=>
            string(7) "minimum"
            ["units"]=>
            string(10) "Fahrenheit"
            ["time-layout"]=>
            string(11) "k-p24h-n7-1"
          }
          ["name"]=>
          string(25) "Daily Minimum Temperature"
          ["value"]=>
          array(7) {
            [0]=>
            string(2) "36"
            [1]=>
            string(2) "40"
            [2]=>
            string(2) "40"
            [3]=>
            string(2) "39"
            [4]=>
            string(2) "37"
            [5]=>
            string(2) "48"
            [6]=>
            string(2) "42"
          }
        }
      }
      ["probability-of-precipitation"]=>
      object(SimpleXMLElement)#11 (3) {
        ["@attributes"]=>
        array(3) {
          ["type"]=>
          string(7) "12 hour"
          ["units"]=>
          string(7) "percent"
          ["time-layout"]=>
          string(12) "k-p12h-n14-2"
        }
        ["name"]=>
        string(38) "12 Hourly Probability of Precipitation"
        ["value"]=>
        array(14) {
          [0]=>
          string(1) "0"
          [1]=>
          string(1) "1"
          [2]=>
          string(1) "1"
          [3]=>
          string(1) "3"
          [4]=>
          string(1) "3"
          [5]=>
          string(2) "13"
          [6]=>
          string(1) "7"
          [7]=>
          string(1) "0"
          [8]=>
          string(1) "0"
          [9]=>
          string(1) "0"
          [10]=>
          string(1) "0"
          [11]=>
          string(2) "52"
          [12]=>
          string(2) "43"
          [13]=>
          object(SimpleXMLElement)#15 (0) {
          }
        }
      }
      ["weather"]=>
      object(SimpleXMLElement)#12 (3) {
        ["@attributes"]=>
        array(1) {
          ["time-layout"]=>
          string(11) "k-p24h-n7-1"
        }
        ["name"]=>
        string(37) "Weather Type, Coverage, and Intensity"
        ["weather-conditions"]=>
        array(7) {
          [0]=>
          object(SimpleXMLElement)#15 (1) {
            ["@attributes"]=>
            array(1) {
              ["weather-summary"]=>
              string(17) "Increasing Clouds"
            }
          }
          [1]=>
          object(SimpleXMLElement)#16 (1) {
            ["@attributes"]=>
            array(1) {
              ["weather-summary"]=>
              string(13) "Mostly Cloudy"
            }
          }
          [2]=>
          object(SimpleXMLElement)#17 (1) {
            ["@attributes"]=>
            array(1) {
              ["weather-summary"]=>
              string(13) "Mostly Cloudy"
            }
          }
          [3]=>
          object(SimpleXMLElement)#18 (1) {
            ["@attributes"]=>
            array(1) {
              ["weather-summary"]=>
              string(12) "Partly Sunny"
            }
          }
          [4]=>
          object(SimpleXMLElement)#19 (1) {
            ["@attributes"]=>
            array(1) {
              ["weather-summary"]=>
              string(12) "Partly Sunny"
            }
          }
          [5]=>
          object(SimpleXMLElement)#20 (2) {
            ["@attributes"]=>
            array(1) {
              ["weather-summary"]=>
              string(19) "Chance Rain Showers"
            }
            ["value"]=>
            object(SimpleXMLElement)#22 (1) {
              ["@attributes"]=>
              array(4) {
                ["coverage"]=>
                string(6) "chance"
                ["intensity"]=>
                string(5) "light"
                ["weather-type"]=>
                string(12) "rain showers"
                ["qualifier"]=>
                string(4) "none"
              }
            }
          }
          [6]=>
          object(SimpleXMLElement)#21 (0) {
          }
        }
      }
      ["conditions-icon"]=>
      object(SimpleXMLElement)#13 (3) {
        ["@attributes"]=>
        array(2) {
          ["type"]=>
          string(12) "forecast-NWS"
          ["time-layout"]=>
          string(11) "k-p24h-n7-1"
        }
        ["name"]=>
        string(16) "Conditions Icons"
        ["icon-link"]=>
        array(7) {
          [0]=>
          string(54) "http://www.nws.noaa.gov/weather/images/fcicons/sct.jpg"
          [1]=>
          string(54) "http://www.nws.noaa.gov/weather/images/fcicons/bkn.jpg"
          [2]=>
          string(54) "http://www.nws.noaa.gov/weather/images/fcicons/bkn.jpg"
          [3]=>
          string(54) "http://www.nws.noaa.gov/weather/images/fcicons/sct.jpg"
          [4]=>
          string(54) "http://www.nws.noaa.gov/weather/images/fcicons/sct.jpg"
          [5]=>
          string(61) "http://www.nws.noaa.gov/weather/images/fcicons/hi_shwrs50.jpg"
          [6]=>
          object(SimpleXMLElement)#21 (0) {
          }
        }
      }
      ["hazards"]=>
      object(SimpleXMLElement)#14 (3) {
        ["@attributes"]=>
        array(1) {
          ["time-layout"]=>
          string(10) "k-p7d-n1-3"
        }
        ["name"]=>
        string(33) "Watches, Warnings, and Advisories"
        ["hazard-conditions"]=>
        object(SimpleXMLElement)#21 (0) {
        }
      }
    }
  }
}

Open in new window

How can I assign the "Daily Maximum Temperature" values to strings?
0
Comment
Question by:IT_Architect
  • 2
  • 2
5 Comments
 
LVL 108

Accepted Solution

by:
Ray Paseur earned 250 total points
Comment Utility
Please see the answer here:
https://www.experts-exchange.com/questions/28982054/PHP-code-to-retrieve-NDFD-weather-forecasts.html#a41883992

See especially $name and $values in the code example.

Please let us know if you still have any questions!
0
 
LVL 16

Assisted Solution

by:Chris Harte
Chris Harte earned 250 total points
Comment Utility
In this article simpleXML is used to parse an RSS feed. It also shows how to assign variables from the namespaces and attributes.

https://www.experts-exchange.com/articles/11342/Reading-XML-Namespaces-using-PHP-Without-regex.html
1
 

Author Comment

by:IT_Architect
Comment Utility
I assigned best solution and assisted solution before, but this morning when I look through them, I had to do some over again.  Let me know if I'm doing something wrong.
0
 
LVL 108

Assisted Solution

by:Ray Paseur
Ray Paseur earned 250 total points
Comment Utility
Yeah, E-E has made some "improvements" to the question closing process that have rendered it nearly incomprehensible.  Hope they get this fixed soon!
0
 

Author Closing Comment

by:IT_Architect
Comment Utility
Tremendous help understanding this.
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