PHP计数器

<?php

      $counterFile = "balong.txt";//存储数值的文件名几路径

      function displayCounter($counterFile) {
            $fp = fopen($counterFile,"rw");
            $num = fgets($fp,5);
            $num += 1;
            print "您是第 "."$num"." 个看[Int..09]→L 计数器的朋友";
            exec( "rm -rf $counterFile");
            exec( "echo $num > $counterFile");
       }

      if (!file_exists($counterFile)) {
            exec( "echo 0 > $counterFile");
      }

      displayCounter($counterFile);

?>