php convert ../ into full path

Question

I want to convert ../ into full paths.For example I have following urls in css in https://example.com/folder1/folder2/style.css

img/example1.png
/img/example2.png
../img/example3.png
../../img/example4.png
https://example.com/folder1/folder2/example5.png

I want to convert them into full path like below for above examples

https://example.com/folder1/folder2/img/example1.png
https://example.com/folder1/folder2/img/example1.png
https://example.com/folder1/img/example1.png
https://example.com/img/example1.png
https://example.com/folder1/folder2/example5.png

I tried something like below

$domain = "https://example.com";
    function convertPath($str)
    {
  global $domain;
       if(substr( $str, 0, 4 ) == "http")
        {
           return $str;
        }
      if(substr( $str, 0, 1 ) == "/")
        {
           return $domain.$str;
        }    
    }

I know am complicating it , There must be some easy way to this kind of operation.Please guide me .Thank you.

I am creating Something like httrack using php , so base url wont help — Gracie williams, May 05 '18 at 12:36
not sure if this help, or else, try the following query "php convert relative to absolute url": https://stackoverflow.com/questions/4444475/transfrom-relative-path-into-absolute-url-using-php — ariefbayu, May 05 '18 at 13:19
Possible duplicate of [How to get base URL with PHP?](https://stackoverflow.com/questions/2820723/how-to-get-base-url-with-php) — JohnnyDevNull, May 05 '18 at 13:25

Casimir et Hippolyte · Accepted Answer · 2018-05-05T16:55:58.100

A simple idea:

build an array of folders with the url
when the folder (of the path) is .., pop the last item of the array
when it is ., do nothing
For other folders, push them.

Then you only have to join the folder array with / and to prepend the scheme and the domain.

$url = 'https://example.com/folder1/folder2/style.css';

$paths = [ 'img/example1.png',
           '/img/example2.png',
           '../img/example3.png',
           '../../img/example4.png',
           'https://example.com/folder1/folder2/example5.png' ];

$folders = explode('/', trim(parse_url($url, PHP_URL_PATH), '/'));
array_pop($folders);
$prefix = explode('/' . $folders[0] . '/', $url)[0]; // need to be improved using parse_url to re-build
                                                     // properly the url with the correct syntax for each scheme.

function getURLFromPath($path, $prefix, $folders) {
    if ( parse_url($path, PHP_URL_SCHEME) )
        return $path;

    foreach (explode('/', ltrim($path, '/')) as $item) {
        if ( $item === '..' ) {
            array_pop($folders);
        } elseif ( $item === '.' ) {
        } else {
            $folders[] = $item;
        }
    }

    return $prefix . '/' . implode('/', $folders);
}

foreach ($paths as $path) {
    echo getURLFromPath($path, $prefix, $folders), PHP_EOL;
}

demo

php convert ../ into full path

1 Answers1