请求帮助将链接计数器（txt文件）添加到php重定向链接代码

Question

Im asking for help to add a counter for my link redirect code.

The link redirect code looks like this:

<?

$id = preg_replace("/[^0-9]/","",$_GET['id']);

$x[101] = "http://www.ebay.com";
$x[102] = "http://www.google.com";
$x[103] = "http://wikileaks.org";
$x[104] = "http://potato.com";

if (isset($x[$id])){}
    else {
     die (header("Location: http://www.google.com"));}

header("Location: $x[$id]");
exit;
?>

That code lies in a file called link.php, and then I use links like www.mysite.com/links.php?id=103 . When someone clicks that link the code will direct them to http://wikileaks.org.

Now what im looking for is to count the hits for the different links 101 to 104 without using mysql.

Maybe something like this? http://www.stevedawson.com/scripts/text-counter.php

<?php

    if (file_exists('count_file.txt')) 
    {
        $fil = fopen('count_file.txt', r);
        $dat = fread($fil, filesize('count_file.txt')); 
        echo $dat+1;
        fclose($fil);
        $fil = fopen('count_file.txt', w);
        fwrite($fil, $dat+1);
    }

    else
    {
        $fil = fopen('count_file.txt', w);
        fwrite($fil, 1);
        echo '1';
        fclose($fil);
    }
?>

I have no idea how to add it to my redirect code, and also hopefully make it work for all the links. Counting each link, and hopefully not creating a 100 different text files, as the real site has lots more links than my example code above. Any ideas?

Answer 1

How about adding it to an array, increment it and serialize the array to a file?

<?php
$id = preg_replace("/[^0-9]/","",$_GET['id']);

$x[101] = "http://www.ebay.com";
$x[102] = "http://www.google.com";
$x[103] = "http://wikileaks.org";
$x[104] = "http://potato.com";

// Open and lock file
$filename = 'count_file.dat';
$fil  = fopen($filename, 'c+');
while(!flock($fil, LOCK_EX)) 
    usleep(rand(1, 10000));

// Read data    
$dat = unserialize( fread($fil, filesize($filename) ) );
if ( !is_array( $dat ) )
    $dat = array();

// Count
if ( isset($dat[$id]) )
    $dat[$id]++;
else
    $dat[$id] = 1;

// Write and unlock file
fseek( $fil, 0 );
fwrite($fil, serialize($dat));
fflush($fil);
flock($fil, LOCK_UN);
fclose( $fil );

if (isset($x[$id])) {
    header("Location: $x[$id]");
} else {
     header("Location: http://www.google.com");
}

exit;

// Count hits
foreach( $x as $k => $v )
{
    if( $dat[$k] > 0 )
        echo 'Site ' . $v . ' has ' . $dat[$k] . ' hits!' . "<br>
";
    else
        echo 'Site ' . $v . ' has no hits!' . "<br>
";
}
?>

I have added locking, so two instances can not read/write to the same file at the same time, giving a corrupt file!

Final Edit Working version which saves hits into an array, serializes them to a single file and reads the array back next time. Also a hits display example at the end. Simplified version!