How Can I Programmatically Get the Base URL in PHP?

Getting the Base URL in PHP

In your development environment, where you are using a local URL such as http://127.0.0.1/test_website/, it can be useful to programmatically obtain the base URL for various functions. However, commonly used methods like dirname(__FILE__) and basename(__FILE__) will not produce the desired output.

Solution 1:

To accurately obtain the base URL, you can utilize the following code:

<?php echo "http://" . $_SERVER['SERVER_NAME'] . $_SERVER['REQUEST_URI']; ?>

This approach uses the $_SERVER predefined variable to access the server name and request URI, effectively constructing the base URL.

Solution 2 (for Supporting HTTPS):

If you need to support HTTPS as well, consider using the following function:

function url(){
  return sprintf(
    "%s://%s%s",
    isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] != 'off' ? 'https' : 'http',
    $_SERVER['SERVER_NAME'],
    $_SERVER['REQUEST_URI']
  );
}

Caution:

When relying on the SERVER_NAME key, ensure that your Apache configuration is set up correctly. If not, you should explicitly specify the server name in your virtual host configuration:

<virtualhost>
    ServerName example.com
    UseCanonicalName on
</virtualhost>

Additional Note:

Using the HTTP_HOST key requires additional cleanup to ensure valid characters for a domain. Consider using the PHP builtin parse_url function for this purpose.

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