Program to get the subdomain of a URL using PHP

Given a URL and the task is to get the sub-domain from the given URL. Use explode() function which breaks a string into array or preg_split() function which splits the given string into array by Regular Expression.

Examples:

Input : subdomain.example.com
Output : subdomain

Input : contribute.geeksforgeeks.org
Output : contribute

Method 1: PHP | explode() Function: The explode() function is an inbuilt function in PHP which is used to split a string in different strings. The explode() function splits a string based on the string delimiters, i.e. it splits the string wherever the delimiter character occurs. This functions returns an array containing the strings formed by splitting the original string.

Syntax:

array explode( separator, OriginalString, NoOfElements )

Use explode() function to get the sub-domain from URL. Getting the sub-domain using explode() function is easier than getting sub-domain using preg_split() function.



Example 1:

filter_none

edit
close

play_arrow

link
brightness_4
code

<?php
  
$URL = "subdomain.example.com";
  
// Split string into array
$arr = explode('.', $URL);
  
// Get the first element of array
$subdomain = $arr[0];
  
echo $subdomain;
  
?>

chevron_right


Output:

subdomain

Example 2:

filter_none

edit
close

play_arrow

link
brightness_4
code

<?php
  
$URL = "contribute.geeksforgeeks.org";
  
// Split string into array
$arr = explode('.', $URL);
  
// Get the first element of array
$subdomain = $arr[0];
echo $subdomain;
  
?>

chevron_right


Output:

contribute

Method 2: PHP | preg_split() Function: The preg_split() function is an inbuilt function in PHP which is used to convert the given string into an array by Regular Expression. If matching fails, an array with a single element containing the input string will be returned.

Syntax:

array preg_split( $pattern, $subject, $limit, $flag )

Use preg_split() function to get the sub-domain from URL. Passing the Regular Expression as parameter to the function and it split the URL.

Example 1:

filter_none

edit
close

play_arrow

link
brightness_4
code

<?php
  
$URL = "contribute.geeksforgeeks.org";
  
// Escape '.' as special symbol for regular expression.
$arr = preg_split('[\.]', $URL); 
  
$subdomain = $arr[0];
  
echo $subdomain;
?>

chevron_right


Output:

contribute

Example 2:

filter_none

edit
close

play_arrow

link
brightness_4
code

<?php
  
$URL = "ide.geeksforgeeks.org";
  
// Escape '.' as special symbol for regular expression.
$arr = preg_split('[\.]', $URL); 
  
$subdomain = $arr[0];
  
echo $subdomain;
  
?>

chevron_right


Output:

ide


My Personal Notes arrow_drop_up

Check out this Author's contributed articles.

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.




Article Tags :
Practice Tags :


Be the First to upvote.


Please write to us at contribute@geeksforgeeks.org to report any issue with the above content.