If we have a website we would certainly want to know the impressions of our website visitors.
In addition to knowing about information of visitors, a log file is also useful to help analyse the security.
I will go directly to explain the log system file in PHP script:
<?php
// checking the bowsers type
$agent = $_SERVER [HTTP_USER_AGENT];
// * checking where the script is executed from -- GET (URL)
$uri = $_SERVER [REQUEST_URI];
// * checking visitors IP
$ip = $_SERVER [REMOTE_ADDR];
/ * checking where the script is referred from
$ref = $_SERVER [HTTP_REFERER];
// * checking visitors proxy
$original = $_SERVER [HTTP_X_FORWARDED_FOR];
// * checking visitors connection
$via = $_SERVER [HTTP_VIA];
// * variable date
$dtime = date (r);
// * note if visitors use transparent Proxy
// * Then the $_SERVER [HTTP_X_FORWARDED_FOR] will display the visitors IP
// * otherwise $_SERVER [ REMOTE_ADDR] will display the Proxy
// * For clear about Proxy i will explain in another tutorial
// * This is a description of variable entry_line:
$entry_line = "Time: $dtime | Original IP: $ip | Browser: $agent | URL: $uri | referrer: $ref | Proxy: $original | Connection: $via
"; // * <- Attention! This must be a new line or you press enter to create a new line
/ * "fopen ()" function for opening files, "a" is the most important.!,
/ * This works if the file "trace.txt" does not exist in the server then PHP will create
$fp = fopen ( "trace.txt", "a");
/ /* "fputs ()" function for writing into the log file
fputs ($fp, $entry_line);
// * "fclose ()" function to close the file
fclose ($fp);
?>
This file based log system using php function is pretty useful instead of using mysql connection
