[RESOLVED] Simple Problem

weareschizo

I'm very new with writing PHP, could somebody tell me why this isn't working?

<img src="<?php
   if isSet($_GET['growth'])
      $tehchoice = $_GET['growth'];
   if ($tehchoice=="three")
      echo "3by3.PNG";
   elseif ($techchoice=="five")
      echo "5by5.PNG";
   else
      echo "blank.bmp";
?>" align ="right" width="720" height="540" name="growthimg" id="growthimg">

Thanks ahead of time! 😃

bpat1434

If $_GET['growth'] is not set.... $tehchoice is never created.

Since $tehchoice isn't created, you should always be getting "blank.bmp" as the source.

Now, to follow-up: What is the expected result, and what are you currently getting?

weareschizo

Here, I changed it so that $tehchoice is always set.
I also expanded the scope of the code being shown to help with the context. The PHP code is a backup, in case the user doesn't have javascript enabled, I've tested my javascripts, and they work fine, however, when I put this PHP code in nothing shows up at all.

<p><img src="<?php
   $tehchoice = ""
   if isSet($_GET['growth'])
      $tehchoice = $_GET['growth'];
   if ($tehchoice=="three")
      echo "3by3.PNG";
   elseif ($techchoice=="five")
      echo "5by5.PNG";
   else
      echo "blank.bmp";
?>" align ="right" width="720" height="540" name="growthimg" id="growthimg">
<form action="expgrowth.php"
method="get">
<input type="radio" name="growth" value="three" onClick="three()"> 3 by 3 Growth
<br>
<input type="radio" name="growth" value="five" onClick="five()"> 5 by 5 Growth
<script type="text/javascript">
<!--
<input type="submit" value="View Growth"
//-->
</script>
</form></p>

NogDog

You might try the following to see if you get any useful debug info:

<?php
// turn on all errors for debugging -- delete or comment out for production version
ini_set('display_errors', 1);
error_reporting(E_ALL);

// handle growth value from GET data:
$tehchoice = '';  // initialize it
if(isset($_GET['growth'])) 
{
   $tehchoice = $_GET['growth'];
}
else  // output debug info
{
   user_error("No 'growth' value in GET data.");
}
switch ($tehchoice)
{
   case 'three':
      $img = '3by3.PNG';
      break;
   case 'five':
      $img = '5by5.PNG';
      break;
   default:
      $img = 'blank.bmp';
      // output debug info:
      user_error("Invalid value '$tehchoice' for 'growth' value in GET data");
}
// use resulting value in HTML:
?>
<img src="<?php echo $img; ?>" align="right" width="720" height="540" name="growthimg" id="growthimg">

weareschizo

Thanks a lot! It works now... I messed up my logic a bit there...just tired I guess, thanks for helping.

EDIT:
How do I set this to "RESOLVED"?

NogDog

weareschizo wrote:
Thanks a lot! It works now... I messed up my logic a bit there...just tired I guess, thanks for helping.

EDIT:
How do I set this to "RESOLVED"?

At the top of the thread, select the "Thread Tools" drop-down menu, then "Mark Thread Resolved".

bpat1434

You also had a syntax error on your code. You were missing a final semi-colon on the $tehchoice = "" line.

Glad to hear you got it working.