What are the limitations of accessing folders on external domains in PHP?

When accessing folders on external domains in PHP, there are limitations due to security restrictions. One way to work around this limitation is to use cURL to fetch the contents of the external folder and then process it accordingly in your PHP script. 

$url = 'http://example.com/external_folder/';
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$output = curl_exec($ch);
curl_close($ch);

// Process the contents of the external folder fetched using cURL

Keywords

PHP file_get_contents fopen allow_url_fopen cross-domain restrictions

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