来个PHP计数器怎样？

<?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"." 个看巴泷计数器的家伙";
exec( "rm -rf $counterFile");
exec( "echo $num > $counterFile");
}

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

displayCounter($counterFile);

?>
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