How to get a URL from an image that was stored on the server

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It must be very easy but I have no clue how to get the URL of an image from server.

Lets say I have domain named www.example.com and the image has been stored in my

htdocs>www>resources>userid>images>image.jpg

So, I want upload an image and save it through php script into my images folder and return the URL of that image back to browser like,

www.example.com/.../.../images/image.jpg

Is there any php function to get URL of a file?

EDIT:

After looking at answer I thought I should more clarify my self. I am really sorry for misunderstanding,

The help I wanted is to : what if the domain name isn't static I mean you can download and attach my image uploader plugin to your website but now it should dynamically get domain name and http path to your image.


Since i don't have your plugin, i don't know the flow of your code. My guess below, hopefully, you can modify it according to your code.

Suppose i download your plugin to my website and upload an image using it. You can get the image path like this:

<?php
$upload_path = 'PATH_WHERE_IMAGE_IS_UPLOADED';
$image_name = 'NAME_OF_THE_UPLOADED_IMAGE';

$relative_path = $upload_path . DS . $image_name;

$path = str_replace( $_SERVER['DOCUMENT_ROOT'], $_SERVER['SERVER_NAME']
                                                            , $relative_path );

$path = 'http://' . $path; // this is where image is uploaded
?>

Note: This assumes that the upload directory is within the webroot.

Hopefully, this will work.