Combining $_GET[] and a vaiable

[b1011]

Hey guys, im pretty new here, yet im pretty good at php. i decided to register for help with my only question:

 

How do you combine $_GET[]; with a variable.

 

pretend you have a URL: www.url.com/index.php?ID=5

and you had a variable on that page called "$topic"("hello").

 

how would you combine it into one string or variable that is "$topic" and $_GET['ID']?

 

combining the examples above out output a variable : "hello5" correct?

but is this even possible?

 

[mendoz]

Maybe this

 

<?php
$id=$_GET['id'];
// $id=5
$var='hello';
// $var=hello
$newvar=$var.$id;
// $newvar=hello5
?>

[b1011]

i shuld have been more spacific..its more complicated that that. im pulling a variable from a txt i need to execute.

[xenophobia]

Do you mean this:

$myvar = "abc';

$getvar = $_GET['ID'];

 

//if $getvar = "1"

//Then you want to declare a variable $abc1 ?

eval("\$" . $myvar . $getvar . ";");

 

visit: http://my2.php.net/manual/en/function.eval.php for eval() function details.

 

Hope this help you.

[ignace]

<?PHP

// $hello5
${$topic}{$_GET['ID']};

// or the eval() way
eval("\$" . $topic . $_GET['id'] . ";");

?>

[xenophobia]

<?PHP
${$topic}{$_GET['ID']};
?>

 

ignace, may I know what kind of method is this? Does it have a name? I seems many open sources program used this for parsing data into the HTML templates.