Base url define in mail function

You're asking about defining a base URL in a mail function.

In PHP, when sending emails using the mail() function, you can specify a base URL as part of the email's headers. This is useful when you want to include a link or an image in your email that points to a specific URL.

Here's an example of how you can define a base URL in a mail function:

$base_url = 'https://example.com';

$headers = array(
    'From' => '[email protected]',
    'Reply-To' => '[email protected]',
    'Content-Type' => 'text/html; charset=UTF-8',
    'Base-URL' => $base_url
);

$message = 'Hello, this is an email with a link: <a href="'. $base_url. '/path/to/page">Click here</a>';

mail('[email protected]', 'Subject', $message, $headers);

In this example, the $base_url variable is defined as https://example.com. This URL is then included in the email's headers using the Base-URL key. When you include a link in your email message, you can use the $base_url variable to construct the full URL.

For example, if you want to include a link to a specific page on your website, you can use the following code:

<a href="'. $base_url. '/path/to/page">Click here</a>

This will generate a link that points to https://example.com/path/to/page.

Note that the Base-URL header is not a standard HTTP header, so it may not be supported by all email clients or servers. However, it is a common practice to include a base URL in email headers to help with link construction and image loading.