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10.12.2008 at 07:52PM PDT, ID: 23808449
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8.8

If statement not working correctly

Asked by annas in PHP Scripting Language

Tags: , ,

Hi!
  I have uploaded a  webpage I'm working on. Everything seems to work fine, with no errors. Something is wrong with the logic though. I need one variable($db) to be larger than the other($wb) but the function I call to make sure of this isn't working right. It's called gthan and is the last function on the page. There is supposed to be an error msg displayed but instead the program goes ahead with the wrong data and calculates and displays this data.

Here is the code: HTML Form First, Main PHP program  next, the  comparison function next, then the calc function
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<form id="form1" name="form1" method="post" action="rh.php">
    <label> <br />&nbsp;
    <input name="db" type="text" size="4" maxlength="6" />
    <span class="style1">Dry Bulb Temp(Celsius)</span></label>
    <p>
      <label>&nbsp;
      <input name="wb" type="text" size="4" maxlength="6" />
      <span class="style3">Wet Bulb Temp(Celsius)</span></label>
    </p>
    <p>
      <label>&nbsp;
      <input  name="pr" type="text" size="4" maxlength="6" />
      <span class="style4">Ambient Pressure(Millibars)</span></label>
    <br>
    <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
   
	<label>&nbsp;
 
      <input type="submit"  name="Submit" value="Calculate" />
      </label>
    </p>
</form>
 
// Main PHP Program
 
if (isset($_POST['Submit'])) { //open brace MP  a
$db = $_POST["db"];
$wb = $_POST["wb"];
$pr = $_POST["pr"];
gthan($db, $wb);
calc( $db, $wb, $pr);
} // closing brace main prog a
 
// Function gthan
 
function gthan($db,$wb){ //gthan opening brace e
if((int)$db < (int)$wb)
{ // if opening brace f
echo "<br>";
echo "&nbsp";
echo "&nbsp";
echo "<input type='text' size='38' name='gthan2' value='Drybulb must be greater than Wet Bulb'> ";
}// if closing brace f 
 else{ return;}
} //gthan closing brace e
 
// calc function
 
function calc($db, $wb, $pr){ //opening brace calc b
 
if ( ! preg_match('/^\d+$/', $db) || ! preg_match('/^\d+$/', $wb) || ! preg_match('/^\d+$/', $pr)) 
{ // if opening brace c
 
 
echo "<br>";
 
echo "&nbsp";
echo "&nbsp";
echo "<input type='text' size='14' name='error' value='Numbers Only!'>";} //if closing brace c
 
 
else { //  else opening brace d
 
//Calculation Begins
 
$F = 6.112 * exp((17.67*$wb)/($wb+243.5));
 
$Ew = $F;
 
 
$H = 6.112 * exp((17.67*$db)/($db+243.5));
 
$Es = $H;
 
$I = $Ew - $pr*($db-$wb)*.00066*(1+(.00115*wb));
 
$Vpres = $I;
 
$J = ($Vpres/$Es)* 100;
$rh = $J;
$rh = round($rh,3);
 
 
 
$do = $Vpres/6.112;
$logs = Log10($do); 
$Dp = round(((237.7 * $logs)/(7.7-$logs)),3);
 
echo "<br>";
echo "&nbsp";
echo "&nbsp";
 
echo "<input type='text' size='4' name='name' value='$rh'>&nbsp;% Relative Humidity";
echo "<br>";
echo "<br>";
echo "&nbsp";
 
echo " <input type='text' size='4' name='name' value='$Dp'>&nbsp;Dewpoint";}// else closing brace d
} //calc closing brace b
 
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[+][-]10.12.2008 at 08:04PM PDT, ID: 22700008

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[+][-]10.13.2008 at 08:48AM PDT, ID: 22703421

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[+][-]10.13.2008 at 10:04AM PDT, ID: 22704064

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[+][-]10.13.2008 at 12:15PM PDT, ID: 22705333

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[+][-]10.13.2008 at 12:19PM PDT, ID: 22705370

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[+][-]11.01.2008 at 10:14PM PDT, ID: 22860293

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[+][-]11.02.2008 at 06:49AM PST, ID: 22861803

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About this solution

Zone: PHP Scripting Language
Tags: PHP, Fiefox 2 > or IE 6 >, handleys.us
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Solution Provided By: AlexanderR
Participating Experts: 1
Solution Grade: A
 
 
[+][-]11.02.2008 at 07:00AM PST, ID: 22861836

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