I have a .txt file which contains about 100.000 IP's (Blacklisted), I want to check if the current user IP is present in that .txt file, if yes script execution should stop.
What would be the most efficient way to do this without using .htaccess.
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2Please post the code you've already tried. – j08691 Mar 27 '13 at 18:50
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1possible duplicate of [Ban IPs from text file using htaccess](http://stackoverflow.com/questions/13008242/ban-ips-from-text-file-using-htaccess) – mario Mar 27 '13 at 18:50
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possible duplicate of [How to Block 100,000+ Individual IP addresses](http://stackoverflow.com/q/15579620) – mario Mar 27 '13 at 18:51
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I'm not using .htaccess – Marius Prollak Mar 27 '13 at 18:51
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Are you using a database? – Adam Mar 27 '13 at 18:51
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How so ? This Answer explains how I could use that text file with a .htaccess, which I said I'm not using ? – Marius Prollak Mar 27 '13 at 18:52
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So, you're not actually asking for the "most efficient way" after all? – mario Mar 27 '13 at 18:53
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I did, with the addition in the comment that I'm not using .htaccess ? :-) – Marius Prollak Mar 27 '13 at 18:54
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Then please consider reading through the dozens of duplicates we already have on this topic: http://www.google.com/search?q=site:stackoverflow.com+php%20block%20ip%20from%20text%20file – mario Mar 27 '13 at 18:56
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possible duplicate of [How to Block 100,000+ Individual IP addresses](http://stackoverflow.com/questions/15579620/how-to-block-100-000-individual-ip-addresses) – Jocelyn Apr 08 '13 at 02:34
2 Answers
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$file = file_get_contents( "your_text_file.txt" );
if( preg_match( "/$ip/", $file ) ) {
// block
}
If you're going to block using preg_match you may want to add the newline to the search string and escape the period characters because otherwise they will match any single character ( however unlikely, this may block normal users ). Htaccess is much better suited for this or even a database query.
Adam
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This will also match on near same IP's or ? I mean, if I have 127.0.0.12 in the ban list, and my IP is 127.0.0.1 it will also block ? – Marius Prollak Mar 27 '13 at 19:05
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If each IP address is on a new line add \n to the end of the search string for example "/127\.0\.0\.12\n/" you can use str_replace to swap out the "." characters for "\." – Adam Mar 27 '13 at 19:55
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Thanks, in the meantime I found this: `if( preg_match( "#\b{$ip}\b#", $file )` – Marius Prollak Mar 27 '13 at 20:13
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I think the way you are going to store the data will help you to lookup faster. Keeping the data into the sorted format and then try to do the binary search kind of thing help you to search the thing faster. I am just suggesting the theory part :)
Devesh
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