What is the function "HTTP_FROM" in PHP and how can it be used?

The "HTTP_FROM" function in PHP is used to retrieve the referring URL of the current page. This can be useful for tracking where traffic is coming from or for implementing security measures based on the source of the request. To use the "HTTP_FROM" function, you can access it through the $_SERVER superglobal array. 

// Retrieve the referring URL using HTTP_FROM
$referring_url = isset($_SERVER['HTTP_FROM']) ? $_SERVER['HTTP_FROM'] : '';

// Output the referring URL
echo $referring_url;

Keywords

PHP HTTP_FROM function usage web development

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