Remove http:// From The URL

Remove HTTP://, www and slashes from the URL

Below the PHP function removes HTTP, www and slashes. Use preg_replace

<?php
    // Remove http://
    $input = "http://codeweb.wall-spot.com";
    $input = preg_replace( "#^[^:/.]*[:/]+#i", "", 

$input );

    /* Output codeweb.wall-spot.com */
    echo $input;
?>

Credit: Remove PHP HTTP://, www and slashes from URL

How to remove HTTP:// or HTTPS:// from the URL and save to database in Laravel

The above method will do the same as this one. preg_replace will replace the word with your words.

Use any of these

$url = preg_replace( "#^[^:/.]*[:/]+#i", "", $url );

or

$url = preg_replace("(^https?://)", "", $url);

public function removeurl()
{
     $url = request('url');
     $url = preg_replace("(^https?://)", "", $url);

     $post->url = $url;
     $post->save();
}