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PHP code to retrieve NDFD weather forecasts.

Posted on 2016-11-09
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Last Modified: 2016-11-14
What I need is the PHP code to retrieve NDFD weather forecasts.  I find examples, but most with broken links that don't actually work or throw errors.  I'm using PHP 5.3 on a FreeBSD server.
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Question by:IT_Architect
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Ray Paseur earned 500 total points
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Is this what you're looking at?
http://www.nws.noaa.gov/ndfd/

If so, it looks like they have a RESTful API.
http://graphical.weather.gov/xml/rest.php

Here's an example showing what you get back from the API
https://iconoun.com/demo/temp_it_architect.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=38.99&lon=-77.01&listLatLon=&lat1=&lon1=&lat2=&lon2=&resolutionSub=&endPoint1Lat=&endPoint1Lon=&endPoint2Lat=&endPoint2Lon=&centerPointLat=&centerPointLon=&distanceLat=&distanceLon=&resolutionSquare=&zipCodeList=&citiesLevel=&format=24+hourly&startDate=2016-11-09&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

This article has some general information about APIs.
https://www.experts-exchange.com/articles/12239/Introduction-to-Application-Programming-Interfaces.html
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by:IT_Architect
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Hi Ray,
From what I see so far, it looks like you "hit the nail on the head" with that code.  I could not get their code to work for some reason.  All I found was broken links.

PS:  What I need now is a good way to parse it.  If you have some pointers on the best way to post that thread, let me know here.
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Author Closing Comment

by:IT_Architect
Comment Utility
Fabulous!
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LVL 108

Expert Comment

by:Ray Paseur
Comment Utility
See if this helps: https://iconoun.com/demo/temp_it_architect.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=38.99&lon=-77.01&listLatLon=&lat1=&lon1=&lat2=&lon2=&resolutionSub=&endPoint1Lat=&endPoint1Lon=&endPoint2Lat=&endPoint2Lon=&centerPointLat=&centerPointLon=&distanceLat=&distanceLon=&resolutionSquare=&zipCodeList=&citiesLevel=&format=24+hourly&startDate=2016-11-09&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>';

// ACTIVATE THIS TO SEE THE ENTIRE OBJECT
// var_dump($obj);

// SHOW HOW TO ACCESS SOME OF THE PROPERTIES
$t = $obj->head->product->title;
echo PHP_EOL . "TITLE: $t";

$lat = (string)$obj->data->location->point->attributes()->latitude;
$lon = (string)$obj->data->location->point->attributes()->longitude;
$geo = "$lat,$lon";
echo PHP_EOL . "GEOCODE: $geo";

$units  = (string)$obj->data->parameters->temperature[0]->attributes()->units;
$name   = (string)$obj->data->parameters->temperature[0]->name;
echo PHP_EOL . "$name ($units)";

$days   = (array)$obj->data->{'time-layout'}[0]->{'start-valid-time'};
$values = (array)$obj->data->parameters->temperature[0]->value;
$icons  = (array)$obj->data->parameters->{'conditions-icon'}->{'icon-link'};

foreach ($days as $key => $day)
{
    $dow = date('D', strtotime($day));
    $tmp = $values[$key];
    echo PHP_EOL . "$dow $tmp&deg;" . substr($units,0,1);
    echo '<img src="' . $icons[$key] . '" />';
}

Open in new window

Cross-reference:
https://www.experts-exchange.com/questions/28982716/How-can-I-assign-SimpleXMLElements-to-variables.html#a41885047
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Author Comment

by:IT_Architect
Comment Utility
All I can say is WOW!  

The NOAA information I was using disappeared.  I also had a source for bulk information, and that is missing now too.  Now I need to resource that information.  You can do in minutes what takes me days.  Should I start a new thread for what I need, or maybe one for each table that I need or advise if possible?
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LVL 108

Expert Comment

by:Ray Paseur
Comment Utility
Sure - start a new thread.  As long as it shows up in the PHP Zone, I'll see it, and I'll be glad to help.

All the best, ~Ray
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