PHP one file counter

[Gyanu]

PHP Code:

<?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);
    }
?>