Thanks for the comment, not2easy.

I'm not sure how you came to the conclusion that the "actual SVG file is missing"

If you looked at the two links that you snipped (and I understand why you did)

The first URL was to the business management domain and the SVG file displayed correctly.

The second link was a simple cURL script which references the first. So, isn't it logical to assume that the SVG file is referenced correctly?

Or does cURL not recognize URLs in referenced files? Or... perhaps cURL does not like PHP "included files?
Can you clarify?

Sorry to be dense.

The comment that the "actual SVG file is missing" was in your post before it was edited, it was not my conclusion. The part that was removed was originally

You will see that the actual SVG file is missing.

and it was edited because the links needed to be removed. Sorry, but I hope that clarifies your question.

Personally, I don't speak much PHP which is why I did not have a response to your questions. I have had hosts that had disabled cURL which disabled some remote tools I was using. I have run into incompatibility issues between versions of PHP on host servers - but I can't really guess why your script does not work.

I'm sure that with time, others who do have PHP skills will be here to help.

You need to do error checking. The code you posted as it stands wholly relies on your preferred outcome happening. When it doesn't happen, you have no way of knowing what went wrong. It could be that the host disabled cURL, any remote networking, it could be that the URL is redirecting, is gone, or any number of things.

The best reference is the PHP manual e.g. [php.net...]

Here is a wrapper script I've used in a number of places. The first request to webmasterworld.com works, the second one won't because it's a non-existent domain. When printing out the error code it returns error code 6 which [curl.haxx.se...] says is error number 6 "Couldn't resolve host. The given remote host was not resolved." This tells me the host will never return any valid URL because the domain name system is saying the domain name doesn't exist. As you can see from that page there's almost 100 reasons why you don't get the reply you expect.

The reason for your URL failing could be one of many of the reasons listed on that page. The easiest way to find out is to ask cURL to tell you the reason.

<?php

class curl {

 var $hndl; // Handle
 var $opts = [
 CURLOPT_USERAGENT => 'Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:61.0) Gecko/20100101 Firefox/61.0',
 CURLOPT_ENCODING => '',
 CURLOPT_HEADERFUNCTION => array('curl', 'head'),
 CURLOPT_WRITEFUNCTION => array('curl', 'body'),
 ];
 var $i = []; // Info
 var $b = ''; // Response body
 var $h = ''; // Response head
 var $e = ''; // Last error
 var $en = 0; // Last error number

 function head($ch, $data) {
 $this->h .= $data;
 return strlen($data);
 }

 function body($ch, $data) {
 $this->b .= $data;
 return strlen($data);
 }

 function fetch($url, $opts = array(), $getinfo = true) {
 $this->h = $this->b = '';
 $this->i = [];
 $this->hndl = curl_init($url);
 curl_setopt_array($this->hndl, $opts);
 $bool = curl_exec($this->hndl);
 if ($getinfo)
 $this->i = curl_getinfo($this->hndl);
 $this->e = curl_error($this->hndl);
 $this->en = curl_errno($this->hndl);
 curl_close($this->hndl);

 return $bool;
 }
}

$curl = new curl;

// This URL will work
$curl->fetch('https://www.webmasterworld.com', $curl->opts, true);
var_dump($curl->i);
var_dump($curl->h);
var_dump($curl->b);

// This URL won't, why?
$curl->fetch('https://www.dsfjhdsfhdsf.com', $curl->opts, true);
var_dump($curl->i);
var_dump($curl->h);
var_dump($curl->b);
var_dump($curl->e);
var_dump($curl->en);

?>

Sorry, not2easy... without the links, the context of my "actual SVG file is missing"comment didn't even make sense to me, LOL

Thanks for the clarification.

Thanks for the reply "brotherhood of LAN".

I have added the curl_error() function and nothing is returned, (my code is below)
You will notice that I have two URL's in the code. If I uncomment the one without the SVG file and comment out the one with the SVG file, the respective page loads as expected. If I reverse the comment status, the page loads but the SVG file is missing. In neither case is any cURL error displayed.

In the "space_availability_map_outside.php" code there is a line to echo out the full path to the SVG file and that is correct.

Still confused.

<?php
$page_title = "cURL Testing";

// $URL="https://www.[domain_name].com/exhibitors_4_web_2.php?show_id=7";
$URL="https://www.[domain_name].com/space_availability_map_outside.php";

$ch = curl_init();
curl_setopt ($ch, CURLOPT_URL, "$URL");
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt ($ch, CURLOPT_FOLLOWLOCATION, 1);
$contents = curl_exec($ch);

 echo 'Curl error: ' . curl_error($ch);

curl_close($ch);
echo $contents;

?>

You don't even see "Curl error:"?

Try putting

ini_set('display_errors', 1)

at the top of the page. If you reach a memory limit or whatnot, then it would fail at curl_exec. Setting it to display errors will at least tell you if something fatal is happening

I do see the text "Curl error:" at the top of the page but there is no actual error reported.

I also have the following at the top of both pages, the referenced page as well as the page with the cURL code:

ini_set('display_errors', 1);
error_reporting(-1);

And there are no errors reported there either.

I'd run

echo '<pre>'; print_r(curl_getinfo($ch));

After curl_exec, curl will most definitely report any issues with the fetching part and since you're reporting all errors with PHP that should take care of everything else. Since you're seeing the 'curl error' part it's definitely not silently dieing because of excessive memory usage etc.

OK... I received the following from the developer of MapSVG... not a show-stopper, just a little more complicated than I was hoping.

You can't load an SVG file from another domain.

MapSVG loads SVG via an ajax call and loading data from other domains via ajax is prohibited in all browsers because of security reasons.

So you need to upload the SVG file to your new domain and then change the "source" option in MapSVG settings object to reflect the new file path.