Create a site visit counter

<?php
$visit = 1;

if(file_exists("counter.txt"))
{
    $fp    = fopen("counter.txt", "r");
    $visit = fread($fp, 4);
    $visit = $visit + 1;
}

$fp = fopen("counter.txt", "w");
fwrite($fp, $visit);
echo "Total Site Visits: " . $visit;
fclose($fp);