Question

In my test.php I would like to provide a link back to the production script index.php, passing the same GET-parameters:

foreach ($_GET as $key => $val) {
        $get .= "&$key=$val";
}
# this one is wrong - I want to replace just the first "&"
$get = str_replace("&", "?", $get);

echo '<p>You are viewing the test version.</p>

<p><a href="/index.php' . $get .
'">Return to production version</a></p>';

How do I replace just the 1st char in the $get string?

Or maybe there is a nicer way to create a “self-link”?

Answer 1

You should look at $_SERVER['QUERY_STRING'], which contains the query string from the request, except for the first ? charater.

So, for instance, if you were to go to http://example.com/page.php?var1=val1&var2=val2, the contents of $_SERVER['QUERY_STRING'] would be var1=val1&var2=val2

Also, to replace the first character of the string, you can simply use:

if(strlen($string) > 0) // Unexpected behavior would occur with empty strings
{
  $string[0] = '?'; // This would modify the first character of a string
}