To clarify the previously posted note:Dots (.) and spaces ( ) in cookie names are being replaced with underscores (_).
To clarify the previously posted note:Dots (.) and spaces ( ) in cookie names are being replaced with underscores (_).beware, dots (.) in cookie names are replaces by underscores (_)The values of $_COOKIE in general are not identic with the values in $_SERVER["HTTP_COOKIE"]!In phpinfo() $_SERVER["HTTP_COOKIE"] shows the actual value stored in the cookie by the browser in 7bit.In $_COOKIE is this value after a 7bit to 8bit conversion.When all characters in $_SERVER["HTTP_COOKIE"] are in ASCII = 7bit, $_COOKIE is displayed in phpinfo(). When one single character is not in ASCII, phpinfo() shows no value!Although in $_COOKIE is still the 8bit conversion of $_SERVER["HTTP_COOKIE"]!The reason: the 8bit conversion alone is not enough to say what characters are meant.For that the used character-set is necessary.phpinfo() does not know the character-set and better says nothing.When using $_COOKIE in a php-generated web page the environment has the info of used character-set and so the meant characters can be displayed.Three illustrating examples===========================A HTML-form is used to get the content which shall be stored in a cookie named "test".Input string in field "test": door$_SERVER["HTTP_COOKIE"]: test=door$_COOKIE["test"] displayed in phpinfo(): door displayed in any html page: doorInput string in field "test" (ISO-8859-1 used in form): Tür$_SERVER["HTTP_COOKIE"]: test=T%FCr$_COOKIE["test"] displayed in phpinfo(): "" displayed in a ISO-8859-1-html-page: Tür (displayed in a UTF-8-html-page: T�r)Input string in field "test" (UTF-8 used in form): Tür$_SERVER["HTTP_COOKIE"]: test=T%C3%BCr$_COOKIE["test"] displayed in phpinfo(): "" displayed in a UTF-8-html-page: Tür (displayed in a ISO-8859-1-html-page: Tür)PHP replaces dots (.) with underscores (_). To find all original cookie names (and value) you can use $_SERVER['HTTP_COOKIE'].For example to retrieve a cookie set with <?php setcookie('testing.dots', 'value'); ?> you may use:<?php $cookies = explode('; ', $_SERVER['HTTP_COOKIE']); $allCookies = []; foreach($cookies as $cookie) { $keyAndValue = explode('=', $cookie); $allCookies[$keyAndValue[0]] = $keyAndValue[1]; } var_dump($allCookies); /* array(1) { ["testing.dots"]=> string(5) "value" } */ echo $allCookies['testing.dots'];?>