counter

<?php

function getCounter() {
    //selref00001
    $File = "counter.txt";
    $handle = fopen($File, 'c+') ;
    $data = fread($handle, 512) ;
    $count = (int)$data + 1;
    fseek($handle, 0) ;
    fwrite($handle, $count) ;
    $counter = sprintf("%05d", $count);
    return $counter;
}
echo "selref".getCounter();
?>