get path of file from server

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PHP

here is my test code:
i just create a text file and store on server folder name"image".it stored on folder
but when i try to read or check using url but file not exist return from if condition.
all the permission are set to read and write of image folder
so please solve my problem.

<?php

        $FileName="/home/a/public_html/image/"."image_".rand().".txt";
    $binary="hello";
    $Event_file = fopen($FileName, "wb");
    fwrite($Event_file, $binary);
    fclose($Event_file);
    $Path=realpath($FileName);
        echo "path".$Path."<br>";
 //get image file
    $get_path="http://www.myapp.net/image/image_654391973.txt";
echo $get_path ."<br>";
   if(is_file($get_path))
{
echo "file exists on server";
}
else
{
echo "file not exists on server ";
}
?>