What is the purpose of using $_SERVER['HTTP_HOST'] in defining a link in PHP?

When defining a link in PHP, using $_SERVER['HTTP_HOST'] helps ensure that the link is dynamic and will work correctly regardless of the domain or subdomain the code is running on. This is important for creating portable code that can be easily moved between different environments without needing manual adjustments to the links. 

$link = "http://" . $_SERVER['HTTP_HOST'] . "/path/to/page.php";
echo "<a href='$link'>Link</a>";

Keywords

$_SERVER HTTP_HOST defining link PHP

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