php display welcome message

Hello,
I would like to display a welcome message and store the IP address of the client in a text file each (line by line) so that if the user browses through the website he will only get one message.


$ipAddress = file_get_contents('ip_address.txt', true);
$pieces = explode("\n", $ipAddress);
$iFound = false;

foreach ($pieces as $value) {
    if ($value == $raddr) {
    	echo "ip dup\n";
    	$iFound = true;
    	exit;    	
    }
}

if ($iFound == false) {
	echo "ip new\n";	
	file_put_contents("ip_address.txt",$raddr."\n",FILE_APPEND);
}

Open in new window


now my issue is that I can reset the whole file every 24hrs but if a user is on the website he would get the welcome message again.. what can I do so that it deletes older than 24hrs? maybe by adding timestamp|ip_address?
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XK8ERAsked:
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Tom BeckCommented:
You mean instead of using cookies?
0
XK8ERAuthor Commented:
I know I can do this with cookies but for this sample (no cookies)
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GaryCommented:
This is where you would need to be using a database, text files would become very messy and hard to administer. Whereas with a db you could do a quick check against the timestamp of the IP and decide whether to show the message.
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Tom BeckCommented:
Database would be better, but if it must be a text file, consider XML. Use the DOMDocument class to manipulate it.

http://www.php.net/manual/en/class.domdocument.php

That way, you can save the IP address and a timestamp with an expiration date. Then, for every page request, cull out the old and insert the new rather than reset the whole file every 24 hours.

Never actually did this myself however.
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Ray PaseurCommented:
You need to use the HTTP cookies, full stop.  Many clients use services (example: AOL) that do not provide static IP addresses.  You can try to do this without cookies and you'll be successful for some of your clients.  And you'll fail with others.  The professional solution uses cookies.  The PHP session uses cookies.  It's easier to ride the horse in the direction he is already going.

Best of luck with your project, ~Ray
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Tom BeckCommented:
Sounds like a sample project to me, not a real world circumstance.
0
GaryCommented:
In Europe you have to request permission to use cookies, and every website has to explicitly state they are using cookies and give you the option of not being tracked.  There is an exception to the rule where the use of cookies is required to use the site and you can use implied consent if you continue to use the site - though the law is still a bit murky around this.
Of course this would be a lot easier if all ISP's adopted IPv6 and just assigned a static IP to everyone (v6 has billions of available addresses) but then again it might make it easier to track people (search MS and NSA).
I don't know the situation in the US but in Europe if you have broadband then your IP is unlikely to change from year to year.
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