Simple php script to be used with homey which allows it to do something when it rains or will rain

buien.php

<?php

//set the mm of rain you consider it's raining 
$rainthreshold_minutes = "0.1" ; 
$rainthreshold_hours = "0.5" ; 
// according to buienradar there are 5 levels of rain per hour (mm/h)
// 0-2 
// 2-5
// 5-10
// 10-100
// 100+ 
// these are used in the "severity level" 
///
//change below if you know what you are doing  
header("Cache-Control: no-store, no-cache, must-revalidate, max-age=0");
header("Cache-Control: post-check=0, pre-check=0", false);
header("Pragma: no-cache");

if(!isset($_GET['lat'])){
	$lat = "51.244418" ; 
}else{
	$lat = $_GET['lat'] ; 
}

if(!isset($_GET['lon'])){
	$lon = "-5.235900" ; 
}else{
	$lon = $_GET['lon'] ; 
}

echo '{' ;
echo '"location" : {' ;  
echo '"lat" : "'.$lat.'", ' ; 
echo '"lon" : "'.$lon.'", '; 
echo '"http" : "https://www.buienradar.nl/nederland/neerslag/zoom/3uurs?lat='.$lat.'&lon='.$lon.'" },'   ; 

$json = file_get_contents("https://gpsgadget.buienradar.nl/data/raintext?lat=".$lat."&lon=".$lon) ;
$json = urlencode($json) ; 
$data = explode("%0D%0A",$json) ; 

$thishour=$nexthour=$ever = 0;
$rainbyminutes =  $bool_rainbyminutes = '' ; 
$first_rain = "ik heb geen idee" ; 
$rain_stops = "ik heb geen idee" ; 
$bool_rainnow = $bool_rainthis_hour = $bool_rainnext_hour =  'false' ; 
$rain = array(); 

for($i=0;$i<(count($data)-1);$i++){
	$tmp = urldecode($data[$i]) ;
    $tmp2 = explode("|",$tmp) ;
	$neerslg = neerslag($tmp2[0]); 
	$bool_neerslg = "false" ; 
	// check if it will rain now
	if($i==0){
		if($neerslg>=$rainthreshold_minutes){
			$bool_rainnow = 'true' ;
			$bool_neerslg = 'true' ; 
			$first_rain = 'het regent nu.' ; }
	}
	else{
		if($neerslg>=$rainthreshold_minutes){
			$bool_neerslg = 'true' ;  
			if($first_rain == "ik heb geen idee"){
				$first_rain = 'het gaat over '.($i*5).' minuten regenen.' ; 
			}
		}
	}
	$rain[] = $neerslg ; 
	 
	if($i<12){ //add the items 0 to 11 together to calculate the total rain for this hour
		$thishour+= ($neerslg*10)/10 ; 
		$ever += ($neerslg*10)/10 ;} 
	else{  //same for the rest to calculate next hour
		$nexthour+= ($neerslg*10)/10 ; 
		$ever += ($neerslg*10)/10 ; }
		
		$rainbyminutes .= '"'.($i*5).'" : "'.$neerslg.'",' ;
		$bool_rainbyminutes .= '"'.($i*5).'" : '.$bool_neerslg.',' ;
}

$rainbyminutes = rtrim($rainbyminutes, ",") ; 
$bool_rainbyminutes = rtrim($bool_rainbyminutes, ",") ; 

if($thishour>=$rainthreshold_hours){
	$bool_rainthis_hour = 'true' ; 
}
if($nexthour>=$rainthreshold_hours){
	$bool_rainnext_hour = 'true' ; 
}
// print_r($rain) ; 
//find when it will be dry, first find first occurence of rain
$regen_time = '' ; 
if($ever>0){
	for($i=0;$i<count($rain);$i++){
		$regen = $rain[$i]; 
	// if found stop	
		if($regen>0.0){
			$regen_time = $i ;
			break;  }
	}
	//now find the first occurence after the above one
	for($i=$regen_time;$i<count($rain);$i++){
		$regen_stop = $rain[$i]; 
		if($regen_stop==0.0){
			$rain_stops = "het stopt over ".($i*5)." minuten met regenen." ;
			break; }
		else{
			$rain_stops = "het duurt minimaal ".($i*5)." minuten, maar dit kan veranderen." ;}
	}
}

echo '"bool" : {' ; 
echo '"rainnow" : '.$bool_rainnow.','; 
echo '"rainthis_hour" : '.$bool_rainthis_hour.','; 
echo '"rainnext_hour" : '.$bool_rainnext_hour.','; 
echo '"rainbyminutes" : {' ; 
echo ''.$bool_rainbyminutes.'}'; 
echo '},' ; 
echo '"rainby" : {' ; 
echo '"this_hour" : "'.$thishour.'", '; 
echo '"next_hour" : "'.$nexthour.'", '; 
echo '"minutes" : {' ;
echo ''.$rainbyminutes.'}' ; 
echo '},' ; 
echo '"severitylevel" : { ' ; 
echo '"this_hour" : "'.calc_rainlevel($thishour).'", '; 
echo '"next_hour" : "'.calc_rainlevel($nexthour).'" '; 
echo '},' ; 
echo '"homeyquestions" : { ' ; 
echo '"whenstart" : "'.$first_rain.'", '; 
echo '"whenstop" : "'.$rain_stops.'" '; 
//echo '"whenstop_heavy" : "ik heb geen idee", '; 
//echo '"whendry_30" : "ik heb geen idee", '; 
//echo '"whenheavyrain" : "ik heb geen idee" '; 
echo '}}' ;


function neerslag($input){
	$tmp = (($input-109)/32)  ; 
	$tmp = pow(10, $tmp)  ; 
	$tmp = round($tmp,1) ;

	if($tmp == "0" ){
	   return "0.0" ; }
	else{
           return $tmp; 
	}
}

function calc_rainlevel($input){
	
	if(($input>=0 && $input< 2 )){
		return 0 ; }
	elseif(($input>=2 && $input< 5 )) {
		return 1 ; }
	elseif(($input>=5 && $input< 10 )) {
		return 2 ; }
	elseif(($input>=10 && $input<= 100 )) {
		return 3 ; }
	else{
		return 4 ; }				
}


?>