How to Pass Multiple Variables in URLs Using Concatenation?

Passing Multiple Variables in URLs Using Concatenation

In web development, it is often necessary to pass data from one page to another. This can be achieved using various methods, including URL parameters. However, when trying to concatenate multiple variables into a single URL, you may encounter issues when attempting to retrieve them on the receiving page.

To address this issue, it is recommended to use the ampersand (&) as a separator between variable assignments. This character acts as a delimiter, allowing you to append multiple values to the URL. For example:

<code class="php">// Page 1
session_start();
$event_id = $_SESSION['event_id'];
$email_address = "johndoe@example.com";

$url = "http://localhost/main.php?email=$email_address&event_id=$event_id";</code>

<code class="php">// Page 2
if (isset($_GET['event_id'])) {
    $event_id = $_GET['event_id'];
}
if (isset($_GET['email'])) {
    $email_address = $_GET['email'];
}

echo $event_id, $email_address; // Outputs "123johndoe@example.com"</code>

By using the ampersand (&) to concatenate variables, the variables can be correctly processed and retrieved on the receiving page. This allows you to pass multiple pieces of data between pages without encountering "Undefined variable" errors.

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