Add deep links to flipkart affiliate link

I am trying to create a affiliate link geenrator using php. I need help to create a flipkart deep affiliate link,which can remove 'www.' and add 'dl.' if present or add 'dl.' before link. For example if input link was https://www.flipkart.com/?affid=xyz then it sends me https://dl.flipkart.com/dl/?affid=xyz . Same for the below links :-
Input link ---> Output Link
https://flipkart.com/?affid=xyz --> https://dl.flipkart.com/dl/?affid=xyz , or
https://dl.flipkart.com/?affid=xyz --> https://dl.flipkart.com/dl/?affid=xyz , or
https://dl.flipkart.com/?affid=xyz --> https://dl.flipkart.com/dl/?affid=xyz

Thanks in advance.

Use parse_url() to get the url metadata. Now, check for host and just overwrite it with dl.flipkart.com and so goes for the path as well.

Snippet:

<?php

$tests = [
        'https://www.flipkart.com/?affid=xyz',
        'https://flipkart.com/dl?affid=xyz',
        'https://dl.flipkart.com/?affid=xyz',
        'https://dl.flipkart.com/?affid=xyz',
        'https://dl.flipkart.com/dl?affid=xyz',
        'https://flipkart.com/whirlpool-1-5-ton-5-star-split-inverter-ac-white/p/itmf8fb8a675505d?pid=ACNFE6K2BXFY6EKX'
    ];
    
foreach($tests as $test){
    echo $test," => ",getNewURL($test),PHP_EOL;
}

function getNewURL($url){
    $url_parts = parse_url($url);
    $url_parts['host'] = 'dl.flipkart.com';
    $url_parts['path'] .= "/";
    if(strpos($url_parts['path'],"/dl/") !== 0) $url_parts['path'] = '/dl/'.trim($url_parts['path'],"/");

    return $url_parts['scheme'] . "://" . $url_parts['host'] . $url_parts['path'] . (empty($url_parts['query']) ? '' : '?' . $url_parts['query']); 
}