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PHP File Writing Help


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  l was wondering if you might be able to help me. l am trying to find out how to make PHP read a file, and then check if that text is already there, and if so don't re-write it. l'll give out my code for an example.

//text file that counts the peeps that visit the site
 $lne = "line.txt";
 $File = "counter.txt"; 

 $handle = fopen($File, 'r+') ; 
//file open

 $data = fread($handle, 512) ; 
 //file read

 $count = $data + 1;
 //Adds one person :DDDDD
 fseek($handle, 0) ; 

 fwrite($handle, $count) ; 
 //saves the new person

echo 'Count #'.$count;


$File2 = "ips.txt";
fclose($handle) ; 
if (isset($_POST['ip'])) {
	$ip = $_POST['ip'];
	$port = $_POST['port'];
	echo 'Connecting to ' . $ip . ':' . $port;

$ip = getenv("REMOTE_ADDR");
echo '<br>'.$ip;

 $handle2 = fopen($File2, 'r+') ; 
//file open

 $data2 = fread($handle2, 512) ; 
 //file read

fwrite($handle2,"\n" . $ip .':' . $count);
 //saves the new ip


<form method="POST">
<input type="hidden"  name="ip">
<input type="hidden" name="port">

lt just re-writes the lP with the new counter, very annoying. l can filter it out with VB but l want it all to be server sided. Thank you for your time ~Papa Beans

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It sounds like you are asking how to not write the visitor's IP Address to the second file if it is already there. This would be a simple matter except for the fact that you are appending the counter to the IP address, why is that?


Anyway, without the counter added, it would go something like this:


if (file_exists($File2)) $ipList = file($File2, FILE_IGNORE_NEW_LINES);
else $ipList = array();

if (!in_array($ip, $ipList)) {
  file_put_contents($File2, $ip . "\n", FILE_APPEND | LOCK_EX);
If you really need/want the :$counter appended to the IP Address, you will have to walk the array ($ipList) and compare the IP address part with the user's IP address. If you get through the entire array and don't find the user's IP, then you would add it.


Note: the code above requires PHP 5.0 (for some of the flags).


Note: Using file storage like this is not best practice. You are single-threading through the file, which means if multiple users hit the code at the same time, they will have to wait for the others to complete. Also, if two users from the same IP address read the file at the same time, and neither finds their IP in the file they will BOTH add it, causing duplication. You can attempt to use fopen, fread, fwrite, and fclose, to keep the file locked, but again that leads to delays for the user. This type of thing is best done with a database.

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