CVS: phpweather phpweather.php,1.28,1.29

[Martin G. <gim...@us...>]

Update of /cvsroot/phpweather/phpweather
In directory usw-pr-cvs1:/tmp/cvs-serv19064

Modified Files:
	phpweather.php 
Log Message:
Support for humidex thanks to Robin Senior <8r...@ql...>.
See this page for an explaination of humidex:

  http://www.theweathernetwork.com/help/glossary/humidex.htm


Index: phpweather.php
===================================================================
RCS file: /cvsroot/phpweather/phpweather/phpweather.php,v
retrieving revision 1.28
retrieving revision 1.29
diff -u -3 -r1.28 -r1.29
--- phpweather.php	29 Jun 2002 10:51:08 -0000	1.28
+++ phpweather.php	12 Aug 2002 23:52:03 -0000	1.29
@@ -685,6 +685,20 @@
      $decoded_metar['heatindex']['heatindex_c'] =
        number_format(($decoded_metar['heatindex']['heatindex_f'] - 32) / 1.8);
     }
+
+    /*
+     * Compute the humidity index
+     */
+    if (!empty($decoded_metar['rel_humidity'])) {
+      $e = (6.112 * pow(10, 7.5 * $decoded_metar['temperature']['temp_c']
+                        / (237.7 + $decoded_metar['temperature']['temp_c']))
+            * $decoded_metar['rel_humidity'] / 100) - 10;
+      $decoded_metar['humidex']['humidex_c'] =
+        number_format($decoded_metar['temperature']['temp_c'] + 5/9 * $e, 1);
+      $decoded_metar['humidex']['humidex_f'] =
+        number_format($decoded_metar['humidex']['humidex_c'] * 9/5 + 32, 1);
+    }
+
     
     /* Finally we store our decoded METAR in $this->decoded_metar so
      * that other methods can use it.