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php variable won't echo out

Posted on 2009-07-04
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Last Modified: 2013-12-13
Info that is posted from a form:
answer1 = 0;

Variable create on the same page;
$loop365 = 1;

Create a variable from the form data:
$answer1 = $_POST['answer1'];

Join two variables and make a new one:
$answerloop365 = '$answer'.$loop365;

Echo the result:
echo $answerloop365;

The echo = "$answer1" instead of "0"

What am I doing wrong?
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Question by:bschwarting
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16 Comments
 
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Expert Comment

by:Erbureth
ID: 24777815
Joining command should look like this:
$answerloop365 = $answer1.$loop365;

your version joined the string "$answer" literally, instead of using $answer1 variable
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Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 24777817
echo $$answerloop365;
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LVL 143

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 24777820
and I am still convinced you are approaching the problem from the wrong end ... and array will be much easier :)
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LVL 1

Author Comment

by:bschwarting
ID: 24777846
erbureth, i want $answerloop365 to = $answer1, that is why I had '$answer'

in this code:
if ( $answerloop365 == '1' ) {

$answerloop365 always = $answer1 instead of 0

angel, i couldn't get that to work either, i tried:
if ( $$answerloop365 == '1' ) {
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LVL 143

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 24777855
sorry, forgot the { } :
http://php.net/manual/en/language.variables.variable.php

echo ${$answerloop365};

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Expert Comment

by:Erbureth
ID: 24777857
Ok, now I am confused. Why should

echo $answerloop365;

display 0 if you assign it value '$answer'.$loop365, so it is bound to display the string "$answer" followed by value $loop365?

what exactly are you trying to achieve?
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Expert Comment

by:Erbureth
ID: 24777865
i see it now, sorry for misleading you
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Author Comment

by:bschwarting
ID: 24777866
i want $answerloop365 to = $answer1 and $answer1 = 0
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LVL 111

Expert Comment

by:Ray Paseur
ID: 24777936
Run phpinof() as shown below and check to see if register_globals is set to OFF.  You want it set to OFF for security reasons, but the language in the original post made me unsure whether you're doing this stuff in the right order.  

It would be helpful if you can show us the code you are using now.  Thanks, ~Ray
<?php phpinfo(); ?>

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Expert Comment

by:Ray Paseur
ID: 24777940
Also, be sure you are not confusing $answer and $answer1 - they are different variables.
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Accepted Solution

by:
stevepicks earned 2000 total points
ID: 24777975
try this one
<?php
 $answer1 = 0;
//$answer1 = $_POST['answer1'];
//Variable create on the same page;
$loop365 = 1;

//Create a variable from the form data:


//Join two variables and make a new one:
$answerloop365 = ${'answer'.$loop365};
 
//Echo the result:
echo $answerloop365;

 

?>
0
 
LVL 111

Expert Comment

by:Ray Paseur
ID: 24777977
To achieve this:

"i want $answerloop365 to = $answer1 and $answer1 = 0"

Just do this:

$answerloop365 = $answer1 = 0;
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Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 24777988
did you try my suggestion?
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Expert Comment

by:profya
ID: 24779113
It works if you replaced the single quotes with double quotes, since php parser does not attempt to parse strings encapsulated within single quotes:
$answerloop365 = "$answer".$loop365;

gives you the desired result.
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Expert Comment

by:profya
ID: 24779118
Sorry, I meant:
$answerloop365 = "$answer1".$loop365;
0
 
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Author Comment

by:bschwarting
ID: 24781969
angel, yes I tried yours and couldn't get it to work.

steve, yours worked great!
$answerloop365 = ${'answer'.$loop365};
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