Help accepting null values

rwd5013

Weather Forecast Days 1-15

Snow_cat (snow category) is only forecast out to day 2, after that the value should be read in as "null"

Therefore, I have to somehow set snow_cat as both an integer = 0 (no snow) and as a null value which can be accepted as true within my if/else function.

Here's an example:

$weatherData["snow_cat"]=0;

if($weatherData["qpf_cat"]<1 and $weatherData["sky_cover"]>=0.945
and $weatherData["pop"]<0.3 and $weatherData["snow_cat"]=????
and $weatherData["Fcst_Day"] >=1 and $weatherData["Fcst_Day"] <=15

and $weatherData["major_city"] >=0 and $weatherData["warm_season"] >=0){
$finalWeather="cloudy";
$foundWeather=1;

big_nerd

rwd5013,

Please use [php] and [/php] tags to keep your code in, it will help us to see it clearer.

You wish to place a NULL value in the array?

if($weatherData["qpf_cat"]<1 and $weatherData["sky_cover"]>=0.945
and $weatherData["pop"]<0.3 and $weatherData["snow_cat"] <= 0
and $weatherData["Fcst_Day"] >=1 and $weatherData["Fcst_Day"] <=15
and $weatherData["major_city"] >=0 and $weatherData["warm_season"] >=0){
$finalWeather="cloudy";
$foundWeather=1;

Notice <= 0; if the value is at 0, or NULL, it should still react the same way.

If you wish to ASSIGN it, put -1, or NULL.

Crowly

0 and NULL (+ some other things) is considered empty with the empty() function. So you could try this, and placing a ! in front will check that its not empty.

if($weatherData["qpf_cat"]<1 and $weatherData["sky_cover"]>=0.945
and $weatherData["pop"]<0.3 and !empty($weatherData["snow_cat"])
and $weatherData["Fcst_Day"] >=1 and $weatherData["Fcst_Day"] <=15
and $weatherData["major_city"] >=0 and $weatherData["warm_season"] >=0)

// or if you want to check thats its not empty and has a certain value
if($weatherData["qpf_cat"]<1 and $weatherData["sky_cover"]>=0.945
and $weatherData["pop"]<0.3 
and $weatherData["snow_cat"] <= 0  !empty($weatherData["snow_cat"])
and $weatherData["Fcst_Day"] >=1 and $weatherData["Fcst_Day"] <=15

Tonata

rwd5013;10955535 wrote:
Weather Forecast Days 1-15

Snow_cat (snow category) is only forecast out to day 2, after that the value should be read in as "null"

Therefore, I have to somehow set snow_cat as both an integer = 0 (no snow) and as a null value which can be accepted as true within my if/else function.

Here's an example:

$weatherData["snow_cat"]=0;

if($weatherData["qpf_cat"]<1 and $weatherData["sky_cover"]>=0.945
and $weatherData["pop"]<0.3 and $weatherData["snow_cat"]=????
and $weatherData["Fcst_Day"] >=1 and $weatherData["Fcst_Day"] <=15

and $weatherData["major_city"] >=0 and $weatherData["warm_season"] >=0){
$finalWeather="cloudy";
$foundWeather=1;

There's a difference between NULL, 0 and space. To test if something is NULL or not NULL use a ! character, before it in your IF