Counting button clicks with PHP

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Just trying to count the number of times a button has been clicked, record that to a file so it works for everyone. It's reading the file, but ain't writing. Ideas?

        <form action='' method="post">
        <input type="submit" name="submit" value="Tweet it!" onclick="genTweet()"/>
    </form>

    <br>


    <?php
        $f = fopen('counter.txt', 'r+'); // use 'r+' instead
        flock($f, LOCK_EX); // avoid race conditions with concurrent requests
        $total = (int) fread($f, max(1, filesize('counter.txt'))); // arg can't be 0
        /*if someone has clicked submit*/
        if (isset($_POST['submit'])) {
           rewind($f); // move pointer to start of file so we overwrite instead of append
           fwrite($f, ++$total);
        }
        fclose($f);
    ?>

    This button has been clicked <?php echo $total; ?> times.

asked 56 secs ago

prismspecs

216

Counting button clicks with PHP