i get erros here:
Deprecated: Function ereg() is deprecated in C:\xampp\htdocs\a_upload\zoom.php on line 48

<?php
                $visitors = 0;
                $handle = opendir(session_save_path());
                while(($file = readdir($handle)) != FALSE)
                {
                    if($file != "."&&$file !="..")
                    {
                        if(ereg("^sess",$file))
                        $visitors++;
                    }
                }
                echo "there are $visitors online";
?>

here is my full code if you need to see it

<?php
include("include/header.php");

//grab submitted data
if($_SERVER['REQUEST_METHOD'] == 'POST') //if user add comment
{
    if(empty($_POST['comment']))
    {
    }
    else
    {
        $count = 0;
        $comment_p = $_POST['comment'];
        $user_id_s = $_SESSION['user_id'];      
        $image_id_g = isset($_GET['img']) ? $_GET['img'] : 0;

        //success
        $comment = mysql_query("INSERT INTO comment VALUES(NULL,'$user_id_s','$image_id_g','$comment_p')");

        //count comments and update comments
        $queryget = mysql_query("SELECT comment FROM comment WHERE image_id = $image_id_g");
        while($row2 = mysql_fetch_assoc($queryget))
        {
            $count++;
        }
        $result2 = mysql_query("UPDATE image SET image_comment = '$count'  WHERE image_id = '$image_id_g'");    
    }
}
?>


<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
    <link rel='stylesheet' type='text/css' href='css/top_menu.css' />
    <link rel='stylesheet' type='text/css' href='css/all_css.css' />
</head>

<body>
                <?php
                $visitors = 0;
                $handle = opendir(session_save_path());
                while(($file = readdir($handle)) != FALSE)
                {
                    if($file != "."&&$file !="..")
                    {
                        if(ereg("^sess",$file))
                        $visitors++;
                    }
                }
                echo "there are $visitors online";

                    $image_id = $_GET['img'];
                    $user_name_s = $_SESSION['username'];
                    //$img = intval($_GET['img']);

                    //get image from database
                    $queryget = mysql_query("SELECT image FROM image WHERE image_id = $image_id");
                    $row = mysql_fetch_assoc($queryget);    
                    $image_db = $row['image'];
                    $src = "data:image/gif;base64," . $image_db;

                    //get image name from database
                    $queryget = mysql_query("SELECT image_short_name FROM image WHERE image_id = '$image_id'");
                    $row = mysql_fetch_assoc($queryget);    
                    $image_short_name_db = $row['image_short_name'];

                    //get image size from database
                    $queryget = mysql_query("SELECT image_des FROM image WHERE image_id = '$image_id'");
                    $row = mysql_fetch_assoc($queryget);    
                    $image_des_db = $row['image_des'];


                    //get image size from database
                    $queryget = mysql_query("SELECT image_size FROM image WHERE image_id = '$image_id'");
                    $row = mysql_fetch_assoc($queryget);    
                    $image_size_db = $row['image_size'];

                    //get image size from database
                    $queryget = mysql_query("SELECT image_resolution FROM image WHERE image_id = '$image_id'");
                    $row = mysql_fetch_assoc($queryget);    
                    $image_resolution_db = $row['image_resolution'];

                    //get image views from database
                    $queryget = mysql_query("SELECT image_view FROM image WHERE image_id = '$image_id'");
                    $row = mysql_fetch_assoc($queryget);    
                    $image_view_db = $row['image_view'];

                    //get image size from database
                    $queryget = mysql_query("SELECT image_comment FROM image WHERE image_id = '$image_id'");
                    $row = mysql_fetch_assoc($queryget);    
                    $image_comment_db = $row['image_comment'];

                    //get all comments
                    $result2 = mysql_query("SELECT * FROM comment WHERE image_id = '$image_id' ORDER BY image_id DESC");



                    echo"
                        <div id ='bg4'>
                            <div id='context4'>

                                <div class='image_nu'>
                                    <br/><img src=\"$src\"  class='image' /><br/><br/>
                                        <b><font color='#1d98d6'> " . $image_short_name_db . "</font></b><br/>
                                        <b><font color='#1d98d6'>By: " . $user_name_s . "</font></b><hr/>
                                </div>

                                <div id='image_des'>
                                     " . $image_des_db . "<br/><br/>
                                </div>

                                <div id='image_bottom'>

                                    <form class='form' action='zoom.php?img=$image_id' method='post'>
                                        <b> " . $user_name_s . " - Add a Comment:</b><br/>
                                        <pre> <textarea class='textarea' name='comment'></textarea></pre>
                                        <pre> <input type='submit' class='button' name='submit' value='Add comment' /></pre>
                                     </form>
                                </div>

                                <div id='image_right'>
                                    <div id = 'nav2'>
                                        <ul>
                                            <li><a href=\"editimage.php?img=".$image_id."\">Edit</a></li> 
                                            <li><a href='#'>Delete</a></li>
                                        </ul>
                                    </div>
                                </div>

                                <div id='image_right2'>
                                    <div class='form'>
                                        <b>Statistics:</b><br/>
                                        <b>View: " . $image_view_db . "</b><br/>
                                        <b>Comment: " . $image_comment_db . "</b><br/><hr/>
                                        Image information:<br/>
                                        <b>Size: " . $image_size_db . "</b><br/>
                                        <b>Resolution: " . $image_resolution_db . "</b><br/>
                                    </div>
                                </div>       

                                <div id='image_comment' class='form'> ";
                                        while($row2 = mysql_fetch_assoc($result2))
                                        {
                                            $comment_db = $row2['comment'];  //get comment from comment table
                                            $user_id_db = $row2['user_id'];  //get user id from comment table

                                            //get user name from user table
                                            $queryget = mysql_query("SELECT username FROM user WHERE user_id = '$user_id_db'");
                                            $row = mysql_fetch_assoc($queryget);    
                                            $user_name_db = $row['username'];

                                            echo"<font color='#DBDBDB'>$user_name_db</font><br/>";
                                            echo"$comment_db <br/><br/><hr/><hr/>";
                                        }

                            echo"</div>
                                <br/>
                            </div>
                        </div>
                    ";
                ?>
</body>


<?php
    include("include/footer.php");
?>

You should replace ereg with preg_match.

preg_match

Warning: preg_match() [function.preg-match]: No ending delimiter '^' found in C:\xampp\htdocs\a_upload\zoom.php on line 47

if( preg_match("^sess",$file))

preg_match requires delimiters around the regex.

preg_match($pattern, $subject, $matches, PREG_OFFSET_CAPTURE, 3);

$pattern = "^sess";

subject = $file;

$matches = ?
PREG_OFFSET_CAPTURE?
3?

Just look at example #1.

i did i just didnt get it

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