What is CLI server?

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I am using getallheaders() php global function to get all the headers of the current request. In php manual for it says that it is a alias of the apache_request_headers and it becomes available in CLI server. what is meant by CLI server?

codeigniter apache php
2 Answers

With the php's bug #66606, the php's built-in web server stores the Content-Type and Content-Length header values in HTTP_CONTENT_TYPE and HTTP_CONTENT_LENGTH fields.

You can get these values depending on the value of PHP_SAPI:

if ('cli-server' === PHP_SAPI) {
    if (array_key_exists('HTTP_CONTENT_LENGTH', $_SERVER)) {
         $content_length = $_SERVER['HTTP_CONTENT_LENGTH'];
    }
    if (array_key_exists('HTTP_CONTENT_TYPE', $_SERVER)) {
        $contentType = $_SERVER['HTTP_CONTENT_TYPE'];
    }
}
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