creating comments on my server

[nokmaster]

Hi, im creating a txt from my web.. but when i check it in my cpanel why Comments isn't create?

this is the code.. when i test this from my localhost its working properly..
whats wrong with this?

<table width="100%" height="100%">
<?php

        // filename

        $file = "Comments.txt";

        // validate form 
        
        function form_validate () {
                
                if (sizeof($_POST) < 1) return false;
                
                foreach ($_POST as $name => $value) {
                        if (empty($name) || !isset($name)) {
                                return false;
                        }            
                }
                return true;
        }
        
        function blank_replace ($str) {
                return str_replace (" ","|",$str);
        }
        
        function stick_escape ($str) {
                return str_replace ("|"," ",$str);
        }


        if (form_validate()) {
                    
                $fp = fopen ($file,"at");
                fwrite ($fp,uniqid(rand(),true)."\t".blank_replace($_POST['name'])."\t".blank_replace($_POST['comment'])."\n");
                fclose ($fp);                        
        }

        if (!file_exists($file)) {
                echo "Here, no commments"; //sorry my bad english
        } else {

                $fp = fopen ($file,"r");
        
                while ($info = fscanf ($fp,"%s\n%s\n%s\n\n")) {        
                        list ($id,$name,$comment) = $info;
?>

<table border="1" width="47%">
  <tr>
    <td width="26%">Name : </td>
    <td width="74%"><?=stick_escape($name)?></td>
  </tr>
  <tr>
    <td width="26%">Comment:</td>
    <td width="74%"><?=stick_escape($comment)?></td>
  </tr>
</table>
<br>

<?php        
                }        
        }

?>


<hr>

<form action="index.php" method="post">
Name :
<br>
<input name="name" type="text" size="30">
<br>
Comment :
<br>
<textarea cols="30" name="comment"> </textarea>
<br>
<input type="submit" value="Submit">
</form>
</table>