PHP - Create . TXT file with Visitors' IP log

Question

I have the following link:

<a target='_blank' class='btn-primary' href='exemplo/1/'> Clique Aqui </a>

I need every time the page containing this link is accessed by a different visitor ( IP ), change the number on the link.

I think it would be interesting to create a file .txt containing the numbers of each IP and the number each IP will be responsible for.

Example ( numbers.txt ):

123.456.789.00 - 1
321.543.765.99 - 2
543.210.456.22 - 3
435.647.533.33 - 4

And so consecutively...

I need it checked if the visitor’s IP is already on that list, if he is taking the number that is responsible for this IP and puts it on the link, if he is not, then the new IP is added to the list and aggregated the number that he will be responsible for and then placed on the link, being like this:

Example: The Visitor has an IP address 321.543.765.99 who was responsible for the 2.

Then it will be displayed:

<a target='_blank' class='btn-primary' href='exemplo/2/'> Clique Aqui </a>

Is it possible to do this? How?

Answer 1

A scope for how you can implement:

The txt file for testing is like this

123.456.789.00 - 1
321.543.765.99 - 2
543.210.456.22 - 3
435.647.533.33 - 4

This is the routine:

<?php

$ip = '123.123.123.123';
$file = __DIR__.DIRECTORY_SEPARATOR.'tmp6.txt';
$content = file_get_contents($file);

$number = null;
$ip_len = strlen($ip) + 3;
$pos = strpos($content, $ip);

if ($pos !== false) {
    $part1 = substr($content, $pos + $ip_len);
    //echo $part1.'<br> len '.strlen($part1);
    //var_dump(strpos($part1, PHP_EOL));
    $number = substr($part1, 0, strpos($part1, PHP_EOL));
} else {
    $pos = strrpos($content, ' ');
    //var_dump($pos);
    $number = trim(substr($content, $pos)) + 1;
    $fs = fopen($file, 'a');
    fwrite($fs, $ip.' - '.$number.PHP_EOL);
    fclose($fs);
}

echo 'number '.$number;

Be aware that it is possible to optimize and, the above script has inconsistency regarding possible failures.

The script relies on the value of PHP_EOL as a line break character. In certain environments or situations it may be incompatible. Example txt can be saved with multiple line breaks. To minimize this problem, make sure you always save with the same formatting pattern.

Still, consider using Sqlite or other logic to simplify this problem that might not even exist.

One suggestion is to just encode the IP and use this encoded string instead of the number to form the URL. In this case you do not need to do anything of this junk with txt, sqlite, nothing at all. A single line would already solve

echo md5($ip);

This is how I would solve the problem, to avoid having to give all this turn that seems unnecessary. Finally, the decision is each.