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2009 raphael.pi 1 
<?php
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2112 richard 3 
//store user @IP who can join this page (still have their status.php tab open) in a file.
2108 richard 4 
$filename='/var/tmp/havp/current_users.txt';
2009 raphael.pi 5 
$change_me = 1;
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2112 richard 7 
//check if file exists
2009 raphael.pi 8 
if(file_exists($filename)){
2112 richard 9 
        $current_users_file = fopen($filename, "r");
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	$content = file($filename);
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	fclose($current_users_file);
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// if file is empty, we put user @IP in it.
2009 raphael.pi 13 
        if(empty($content))
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        {
2112 richard 15 
                file_put_contents($filename, $_SERVER['REMOTE_ADDR'].PHP_EOL);
2009 raphael.pi 16 
        }
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        else
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        {
2112 richard 19 
// if we found duplicate user IP, it will not be writen again
2009 raphael.pi 20 
                foreach($content as $line){
2278 richard 21 
                        $line = preg_replace('/\s+/', '', $line); #remove whitespace
2009 raphael.pi 22 
                        if($line == $_SERVER['REMOTE_ADDR'])
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                        {
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                                $change_me = 0;
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                        }
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                }
2112 richard 27 
// else we write user IP in the file
2009 raphael.pi 28 
                if($change_me)
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                {
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                        file_put_contents($filename, $_SERVER['REMOTE_ADDR'].PHP_EOL , FILE_APPEND);
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                }
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        }
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}
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else
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{
2112 richard 36 
//The file doesn't exist. We create it and write user @IP.
2009 raphael.pi 37 
	file_put_contents($filename, $_SERVER['REMOTE_ADDR'].PHP_EOL);
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}
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?>