php url from a specific domain

using php is there a way to make a URL not show unless it comes from a specific domain?
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Julian HansenCommented:
Show where?
Loganathan NatarajanLAMP DeveloperCommented:
you can use HTTP_REFERER  .. to check for specific domain request...


// check the request coming from specific domain
$refData = parse_url($ref);

if($refData['host'] == '') 
  // redirect to the url page
  header('Location: http://localhost...');
	echo "Invalid request";	


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Ray PaseurCommented:
HTTP_REFERER will work some of the time.  The times when it will fail are when the client request comes from an attack vector or from a cURL request which can spoof the value.

What is the business need here?  If you explain that for us then we may be able to suggest some solutions.
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