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Beginner needing help with json script

mkozlow

By mkozlow
in PHP Coding Help

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mkozlow Newbie

mkozlow

Posted
Posted

So im trying to use a script to fetch the weather forecast from weatherunderground and im using their weather API functionality.

 

Basically im trying to get the output to be something like (Continuing down in a list)

(Day of week): (Current conditions) (High temp)-(Low temp)

 

this is what I have:

#!/usr/bin/php
<?php
$json_string = file_get_contents("http://api.wunderground.com/api/MY_APIKEY/forecast/q/19104.json");
$parsed_json = json_decode($json_string);
$day = $parsed_json->{'forecast'}->{'simpleforecast'}->{'forecastday'}->{'date'}->{'weekday_short'};
$high = $parsed_json->{'forecast'}->{'simpleforecast'}->{'forecastday'}->{'high'}->{'fahrenheit'};
$low = $parsed_json->{'forecast'}->{'simpleforecast'}->{'forecastday'}->{'low'}->{'fahrenheit'};
$conditions = $parsed_json->{'forecast'}->{'simpleforecast'}->{'forecastday'}->{'conditions'};

echo "Forecast:\n";
echo "${day}: ${conditions} ${high}-${low}\n";
?>

 

the output of the get_file_contents is:

 "response":  {
    "version": "0.1",
    "termsofService": "http://www.wunderground.com/weather/api/d/terms.html",
    "features":  {
      "forecast": 1
    }
  },
  "forecast":  {
    "txt_forecast":  {},
    "simpleforecast":  {
      "forecastday":  [
         {
          "date":  {
            "epoch": "1330398000",
            "pretty": "10:00 PM EST on February 27, 2012",
            "day": 27,
            "month": 2,
            "year": 2012,
            "yday": 57,
            "hour": 22,
            "min": "00",
            "sec": 0,
            "isdst": "0",
            "monthname": "February",
            "weekday_short": "Mon",
            "weekday": "Monday",
            "ampm": "PM",
            "tz_short": "EST",
            "tz_long": "America/New_York"
          },
          "period": 1,
          "high":  {
            "fahrenheit": "59",
            "celsius": "15"
          },
          "low":  {
            "fahrenheit": "36",
            "celsius": "2"
          },
          "conditions": "Partly Cloudy",
          "icon": "partlycloudy",
          "icon_url": "http://icons-ak.wxug.com/i/c/k/partlycloudy.gif",
          "skyicon": "mostlysunny",
          "pop": 0,
          "qpf_allday":  {
            "in": 0,
            "mm": 0
          },
          "qpf_day":  {
            "in": 0,
            "mm": 0
          },
          "qpf_night":  {
            "in": 0,
            "mm": 0
          },
          "snow_allday":  {
            "in": 0,
            "cm": 0
          },
          "snow_day":  {
            "in": 0,
            "cm": 0
          },
          "snow_night":  {
            "in": 0,
            "cm": 0
          },
          "maxwind":  {
            "mph": 9,
            "kph": 14,
            "dir": "South",
            "degrees": 180
          },
          "avewind":  {
            "mph": 6,
            "kph": 10,
            "dir": "South",
            "degrees": 171
          },
          "avehumidity": 65,
          "maxhumidity": 78,
          "minhumidity": 48
        },
         {
          "date":  {
            "epoch": "1330484400",
            "pretty": "10:00 PM EST on February 28, 2012",
            "day": 28,
            "month": 2,
            "year": 2012,
            "yday": 58,
            "hour": 22,
            "min": "00",
            "sec": 0,
            "isdst": "0",
            "monthname": "February",
            "weekday_short": "Tue",
            "weekday": "Tuesday",
            "ampm": "PM",
            "tz_short": "EST",
            "tz_long": "America/New_York"
          },
          "period": 2,
          "high":  {
            "fahrenheit": "50",
            "celsius": "10"
          },
          "low":  {
            "fahrenheit": "37",
            "celsius": "3"
          },
          "conditions": "Clear",
          "icon": "clear",
          "icon_url": "http://icons-ak.wxug.com/i/c/k/clear.gif",
          "skyicon": "mostlysunny",
          "pop": 0,
          "qpf_allday":  {
            "in": 0,
            "mm": 0
          },
          "qpf_day":  {
            "in": 0,
            "mm": 0
          },
          "qpf_night":  {
            "in": 0,
            "mm": 0
          },
          "snow_allday":  {
            "in": 0,
            "cm": 0
          },
          "snow_day":  {
            "in": 0,
            "cm": 0
          },
          "snow_night":  {
            "in": 0,
            "cm": 0
          },
          "maxwind":  {
            "mph": 8,
            "kph": 13,
            "dir": "NW",
            "degrees": 318
          },
          "avewind":  {
            "mph": 5,
            "kph": 8,
            "dir": "ESE",
            "degrees": 123
          },
          "avehumidity": 53,
          "maxhumidity": 69,
          "minhumidity": 39
        },
         {
          "date":  {
            "epoch": "1330570800",
            "pretty": "10:00 PM EST on February 29, 2012",
            "day": 29,
            "month": 2,
            "year": 2012,
            "yday": 59,
            "hour": 22,
            "min": "00",
            "sec": 0,
            "isdst": "0",
            "monthname": "February",
            "weekday_short": "Wed",
            "weekday": "Wednesday",
            "ampm": "PM",
            "tz_short": "EST",
            "tz_long": "America/New_York"
          },
          "period": 3,
          "high":  {
            "fahrenheit": "43",
            "celsius": "6"
          },
          "low":  {
            "fahrenheit": "41",
            "celsius": "5"
          },
          "conditions": "Rain",
          "icon": "rain",
          "icon_url": "http://icons-ak.wxug.com/i/c/k/rain.gif",
          "skyicon": "cloudy",
          "pop": 80,
          "qpf_allday":  {
            "in": 0.71,
            "mm": 18
          },
          "qpf_day":  {
            "in": 0.5,
            "mm": 12.7
          },
          "qpf_night":  {
            "in": 0.21,
            "mm": 5.3
          },
          "snow_allday":  {
            "in": 0,
            "cm": 0
          },
          "snow_day":  {
            "in": 0,
            "cm": 0
          },
          "snow_night":  {
            "in": 0,
            "cm": 0
          },
          "maxwind":  {
            "mph": 16,
            "kph": 26,
            "dir": "ESE",
            "degrees": 106
          },
          "avewind":  {
            "mph": 9,
            "kph": 14,
            "dir": "ESE",
            "degrees": 115
          },
          "avehumidity": 91,
          "maxhumidity": 95,
          "minhumidity": 64
        },
         {
          "date":  {
            "epoch": "1330657200",
            "pretty": "10:00 PM EST on March 01, 2012",
            "day": 1,
            "month": 3,
            "year": 2012,
            "yday": 60,
            "hour": 22,
            "min": "00",
            "sec": 0,
            "isdst": "0",
            "monthname": "March",
            "weekday_short": "Thu",
            "weekday": "Thursday",
            "ampm": "PM",
            "tz_short": "EST",
            "tz_long": "America/New_York"
          },
          "period": 4,
          "high":  {
            "fahrenheit": "54",
            "celsius": "12"
          },
          "low":  {
            "fahrenheit": "32",
            "celsius": "0"
          },
          "conditions": "Overcast",
          "icon": "cloudy",
          "icon_url": "http://icons-ak.wxug.com/i/c/k/cloudy.gif",
          "skyicon": "cloudy",
          "pop": 0,
          "qpf_allday":  {
            "in": 0,
            "mm": 0
          },
          "qpf_day":  {
            "in": 0,
            "mm": 0
          },
          "qpf_night":  {
            "in": 0,
            "mm": 0
          },
          "snow_allday":  {
            "in": 0,
            "cm": 0
          },
          "snow_day":  {
            "in": 0,
            "cm": 0
          },
          "snow_night":  {
            "in": 0,
            "cm": 0
          },
          "maxwind":  {
            "mph": 10,
            "kph": 16,
            "dir": "WSW",
            "degrees": 253
          },
          "avewind":  {
            "mph": 4,
            "kph": 6,
            "dir": "West",
            "degrees": 280
          },
          "avehumidity": 95,
          "maxhumidity": 100,
          "minhumidity": 87
        }
      ]
    }
  }
}

 

I feel like i need to define different variables for each day like dayx, highx, lowx, conditionsx, etc where x=period and it increases the period every time you run through. I remember learning this in my intro to java class but in all honesty i forgot, even if i did know if i was on the right path.

 

Any help? I'd appreciate it.

 

Thanks

-Koz

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mkozlow Newbie

mkozlow

Posted
  • Author
Posted

forecastday is actually an array of objects. You can (and should) foreach over it.

 

ok so like i said im a beginner and really dont know wtf im doing.

would i incorporate a foreach while parsing the output? or instead of?

 

would it be appropriate to do something like this (i feel like im missing some syntax (meaning brackets and ; and stuff if you notice shout out please. i should probably be using a script editor instead of notepad but meh):

foreach (forecastday as &$key) {
if ($key = $date) {
	foreach (date as &$d) {
		if $d = $weekday_short {
			$day = $d;}
		else{}
	}}
else if ($key = $high) {
	foreach (high as &$h) {
		if $h = $fahrenheit {
			$hi = $h;}
		else{}
	}}
else if ($key = $low) {
	foreach (low as &$l) {
		if $l = $fahrenheit {
			$lo = $l;}
		else{}
	}}
else if ($key = $conditions) {
	$cond = $key;}
}

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codebyren Member

codebyren

Posted
Posted

You're heading in the right direction but are traversing the data incorrectly.

 

<?php
$json = file_get_contents('weather.json');
$json = json_decode($json);

// You can learn a lot about how PHP interpreted the data by un-commenting these lines:
// print_r($json);
// exit;

// Now it's just a case of following the nested structure to the "forecastday" array.
// (which is an array of objects as requinix mentioned)
foreach ($json->forecast->simpleforecast->forecastday as $day)
{
echo "{$day->date->weekday}: {$day->conditions} <br>";
echo "{$day->low->fahrenheit} - {$day->high->fahrenheit} °F <br>";	
echo '<br>';
}
exit;
?>

 

Hope that helps clear it up.

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