PHP从外部文档根目录插入图像[复制]

Okay, so I'm not so experienced with PHP, and I've been searching for hours for a way to access an image file outside of the document root. I know there are many answers to this question, sort of, but none that actually helped me.

So what I have so far is a folder structure like this (ignore the odd file names):

-img
    -imagez.php
    -logo.php

-public_html
    -files.php

I put this code inside of files.php:

<?php include('/home/byonexco/img/imagez.php'); ?>

If I access files.php from my browser, I see the content of imagez.php, as is expected.

My problem is, I want to be able to do the same thing with the file logo.png. The folder img is not publicly accessible, so I know I have to call the image with PHP.

How can I get logo.png to show on the page when someone accesses the file files.php?

</div>

You could write a very simple script like

<?php
header('Content-Type: image/png');
if (strpos($_GET['img'], '..') === false) // check for quackery
    readfile('../img/' . $_GET['img']);

and access it like

/img.php?img=logo.png

However there are a couple disadvantages to this solution:

• Relaying the image through PHP costs time and performance
• The script is possibly subjectible to exploits, letting an evil person retrieve any file on the server

You're far better off with hosting images directly accessible.

As the image isn't publicly accessible, you'd need to get the image via PHP then output the image with the correct header

$image = file_get_contents('path/to/image.png';
header('Content-Type: image/png');
imagepng($image);
imagedestroy($image);