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2009 raphael.pi 1 
<?php
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//store in a file user @IP who can join this page.
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$filename='/tmp/current_users.txt';
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//change me avoid duplicate user @IP
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$change_me = 1;
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//check if filename exists
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if(file_exists($filename)){
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        $fichier = fopen($filename, "r");
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        $content = file($filename);
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	//if file is empty, we put user @IP in it.
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        if(empty($content))
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        {
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                file_put_contents($filename, $_SERVER['REMOTE_ADDR']);
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        }
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        else
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        {
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        	//if we found duplicate IP, it will not write user @IP in filename (set change_me = 0)
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                foreach($content as $line){
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                        $line = preg_replace('/\s+/', '', $line);
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                        if($line == $_SERVER['REMOTE_ADDR'])
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                        {
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                                $change_me = 0;
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                        }
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                }
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		//if user @IP does not exist, we will write it in filename
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                if($change_me)
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                {
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                        file_put_contents($filename, $_SERVER['REMOTE_ADDR'].PHP_EOL , FILE_APPEND);
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                }
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        }
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}
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else
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{
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	//we create filename and we put user @IP in it.
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	file_put_contents($filename, $_SERVER['REMOTE_ADDR'].PHP_EOL);
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}
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?>