What are some potential reasons why the $_SERVER['CONTENT_LENGTH'] variable may be empty in PHP?

The $_SERVER['CONTENT_LENGTH'] variable may be empty in PHP if the request does not include a content length header, such as in the case of a GET request. To ensure that the $_SERVER['CONTENT_LENGTH'] variable is populated, you can check if it is empty and set it manually based on the content length of the request body. 

if(empty($_SERVER['CONTENT_LENGTH']) && isset($_SERVER['REQUEST_METHOD']) && $_SERVER['REQUEST_METHOD'] === 'POST') {
    $_SERVER['CONTENT_LENGTH'] = strlen(file_get_contents('php://input'));
}

Keywords

$_SERVER CONTENT_LENGTH empty PHP reasons

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