php - counting the site visitors not working -

i use these following codes in main index.php of site number of visitors :

    <?php $file = "counts.html";      if ( is_file( $file )==false )  {touch($file);$open = fopen($file, "w");fwrite($open, "0");fclose($open);}  //read counts $open = fopen($file, "r"); $count = fread($open, filesize($file)); fclose($open);  //if cookie isn't set,then increase counts 1 + save ip, , set cookie pc... $cookie_namee='mycounterr-456';     if (!isset($_cookie[$cookie_namee])) {     $open = fopen($file, "w");     $count++;     fwrite($open, $count);     fclose($open);     setcookie($cookie_namee,"checked",time()+111400);     }  //uncomment below line see visits number on page echo $count; ?> 

it works, not working. there i'm doing in wrong way?

edit : found problem. seems code works, problem value won't overwrite existing value in counts.html

the file writes 0 first time , won't change 0 @ all.

how can fix problem?

any appreciated

thanks in advance

first of must add session_start(); in first line of codes.

it's better save counter numbers .txt file .html file.

now change codes following codes :

    <?php session_start(); $counter_name = "counts.txt";  if (!file_exists($counter_name)) {   $f = fopen($counter_name, "w");   fwrite($f,"0");   fclose($f); }  // read counter values $f = fopen($counter_name,"r"); $counterval = fread($f, filesize($counter_name)); fclose($f);  // check if visitor has been counted in session // if not, increase counter value 1 if(!isset($_session['hasvisited'])){   $_session['hasvisited']="yes";   $counterval++;   $f = fopen($counter_name, "w");   fwrite($f, $counterval);   fclose($f);  } ?>