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// Fetch daily rain_array, this starts with yesterday
$rain_day_string = "[seqday1_rain0_total_mm]";
$rain_day_array = explode(" ", $rain_day_string);
// Need to insert todays rain at the start of the array
array_unshift($rain_day_array,"[day1_rain0_total_mm]");

// Now find the 1st non 0.00 day
while ($rain = current($rain_day_array)) {
    if ($rain != 0.00) break;
next ($rain_day_array);
 }
$dayswithnorain = key($rain_day_array);
//
//get timestamp for the last recorded rain
$rain_time = strtotime("-".$dayswithnorain." day");
//format the date using the timestamp generated
$dateoflastrainalways = date("d/m/Y", $rain_time);