Making A PHP variable from 2 other variables

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I'm starting a magazine which has 3 editions. UK, US, and European. Each will be published online at different times, therefore each has a different issue number.

So I want to create a way of selecting which issue goes with which edition, but I don't know how to join these 2 parts together. The code I'm using is:

<?php
$this_edition = "UK";
?>

<?php
$UK_issue = "1";
$US_issue = "3";
$EU_issue = "2";
?>

<?php
$this_issue = // The Issue Relating to This Edition
?>

What I want to do here is basically call the issue number ( 1/3/2 ) which relates to the $edition I'm udating, in this case, UK.

So essentially : $this_issue = $edition_issue

Does anyone know how I can do this?

What you're trying to do is possible...

$this_issue = ${$this_edition.'_issue'};

But it's way better to use the solution suggested by pr1nc3.

PHP variables, How can I assign one variable to another variable in PHP? You don’t really send variables in php. If you include another php file, the included file will have access to all global variables. If you want to keep the value of some variable between page requests then you will need to store the value somewhere. The easiest places to store values are in cookies, sessions or a database.

How about an array so you have keys and values to match?

For example $magazine = [1 => 'UK', 2 => 'US', 3 => 'EU'];

Array
(
    [1] => UK
    [2] => US
    [3] => EU
)

Your array keys (issues) match the country(edition)

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You may use Associative Array as shown below.

<?php
$this_edition = "UK";
$edition['UK'] = 1;
$edition['US'] = 2;
$edition['EU'] = 3;
$this_issue = $edition[$this_edition];
?>

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How about an array so you have keys and values to match?

$magazine = array(1 => 'UK', 2 => 'US', 3 => 'EU');
$issue=1;
echo $magazine[$issue];

output will be

UK

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I think you have already got your answer, But just want to show you another way if you need to hold more details about your editions and issues in an array.

    <?php
    $this_edition = "UK";

    $editions = array("UK"=>array("name"=>"UK Edition","value"=>1), "US"=>array("name"=>"US Edition","value"=>2), "EU"=>array("name"=>"EU Edition","value"=>3));

    echo $this_issue = $editions[$this_edition]["name"];
    ?>

Output: UK Edition

If you keep your information inside mapped array, you will be able to receive them very easily at any point you need.

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Comments
  • Using arrays would make more sense imo.
  • Maybe I misunderstood your problem, but isn't it just enough to use $this_edition with the value of $*_issue?
  • Meaning? I basically just want to select the issue number based on the Edition!
  • @maio290, the script isn't always going to be UK. I load that based on the Issue type. I want to say something like $this_issue = $edition_issue.
  • Thanks. I've tested it this way and it's working fine, so I'll go with it. I only know basic PHP so I'd like to keep it simple with something that I understand. Thanks again