Problem in reading files with php fopen and in making file manager

and not only this, if I put some php code at the very end of the image file using a notepad it wouldn't display it. check this:

I did a lot of research on why my code isn't working while the tinyFilemanager is perfect with any of the above mention cases , and I found that the whenever I execute the page file via browser it by default uses this

header("Content-Type: text/html");
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so If I wanted to do what I wanted , then I would have to use this:

header("Content-Type: text/x-php");
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which covers both of the above cases, but leads to the 2nd problem.

Problem #2:

<?php
function list_all_files($directory){
//opening the dir
if($handle=opendir($directory.'/')){
echo "looking inside '$directory'"."<br>";
}

while($file=readdir($handle)){
    //listing all the directories without ".." (dots)
    if($file!='.'&&$file!='..') {

    echo '<a href="Read.php?dir='.$directory.'&read='.$directory.'/'.$file.'">'.$file.'</a><br>';
            } //if ends here
        } //while loop endds here
} //list_all_files ends here


function read_file($file)
{
    $handle = fopen($file, "r");
    if ($handle) {
        while (($line = fgets($handle)) !== false) {
            echo($line);
        }
        fclose($handle);
    } else {
       echo "error opening the file";
    }
}


//main function
if(!isset($_GET['dir'])) {
    $dir=getcwd();
}else{
    $dir=$_GET['dir'];
}

//listing all the directories and files in text/html format so that our anchor tag would be available.
ob_start();
header('Content-Type: text/html; charset=UTF-8');
list_all_files($dir);
ob_end_flush();



if(isset($_GET['read'])){
//changing the header to text/php-x so that the php code in any jpg file can be viewed clearly
    ob_clean();
    header('Content-Type: text/x-php; charset=UTF-8');
    ob_start();
    $file1 = $_GET['read'];
    read_file($file1);
    ob_end_flush();
}

?>
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The above codes works perfectly fine, but there is this one problem. since its content-type is not text/html anymore, it wouldn't display the html content on the web page. which is good but bad at the same time because then I wouldn't get the list of directory in the anchor tag form, because I thought ob_start and ob_end_flush(). if I use these two, it would just solve the problem by creating a buffer for each of the function separately and executes it. so when it executes it the above function would be render with the content-type text/html and would show the directory listing with anchor tag, and the 2nd would just be in text/x-php which would solve the above two cases, but I was soooooo wrong.