Checking if a $_COOKIE value is empty or not

I assign a cookie to a variable:

$user_cookie = $_COOKIE["user"];

How can I check if the $user_cookie received some value or not?

Should I use if (empty($user_cookie)) or something else?


Use isset() like so:

if (isset($_COOKIE["user"])){
$user_cookie = $_COOKIE["user"];
}

This tells you whether a key named user is present in $_COOKIE. The value itself could be "", 0, NULL etc. Depending on the context, some of these values (e.g. 0) could be valid.

PS: For the second part, I'd use === operator to check for false, NULL, 0, "", or may be (string) $user_cookie !== "".

Learn About PHP isset Function: PHP isset vs empty Explained, This value is not Null. The variable hasn't been unset using the unset() function. The syntax for making PHP check if a variable exists with  nevermind i solved it by setting the cookie to 0 instead of an empty quotations value. sorry when i said cookie = ""; then i was assuming that it was empty not that it would mean cookie = """" – Pixelknight1398 Apr 30 '16 at 2:46


empty - Manual, Determine whether a variable is considered to be empty. Returns FALSE if var exists and has a non-empty, non-zero value. protected $_items = array(); with trim on the Super Globals such as $_POST, $_GET and $_COOKIE as so far,​  Stack Overflow Public is a cookie, if not then an empty string cookie = $_COOKIE['cookie']; } You would want to check in a way that ensures that expired


If your cookie variable is an array:

if (!isset($_COOKIE['user']) || empty(unserialize($_COOKIE['user']))) {
    // cookie variable is not set or empty
}

If your cookie variable is not an array:

if (!isset($_COOKIE['user']) || empty($_COOKIE['user'])) {
    // cookie variable is not set or empty
}

I use this approach.

setcookie - Manual, If the PHP directive register_globals is set to on then cookie values will also be made If the value argument is an empty string, or FALSE , and all other arguments if(!isset($_COOKIE['random'])){// check if random number cookie is not set A cookie is often used to identify a user. A cookie is a small file that the server embeds on the user's computer. Each time the same computer requests a page with a browser, it will send the cookie too. With PHP, you can both create and retrieve cookie values. Create Cookies With PHP. A cookie is created with the setcookie () function.


Try empty function in php http://php.net/manual/en/function.empty.php

You can also use isset http://www.php.net/manual/en/function.isset.php

Go Web Development Cookbook: Build full-stack web applications with Go, Then, we check whether it is not empty or whether there is a cookie value present​. If the username is not blank, we parse home.html, inject the username as a  creating a form with a hidden field and an empty value; and then assigning some value to it with JS, if the field gets the value – JS is ON, otherwise it’s off. But the form had to be submitted first before PHP can request that hidden field’s value.


isset(), however keep in mind, like empty() it cannot be used on expressions, only variables.

isset($_COOKIE['user']); // ok

isset($user_cookie = $_COOKIE['user']); // not ok

$user_cookie = $_COOKIE['user'];
isset($user_cookie); // ok

(isset() is the way to go, when dealing with cookies)

PHP isset() Function, The isset() function checks whether a variable is set, which means that it has to be declared and is not NULL. This function returns true if the variable exists and is  empty() will not generate warnings if you're testing against an undefined variable as a simple boolean check will. On production systems, warnings are usually shut off, but they are often active on development systems.


PHP setcookie() Function, Example. The following example creates a cookie named "user" with the value "​John Doe". We then retrieve the value of the cookie "user" (using the global variable $_COOKIE). We also use the isset() function to find out if the cookie is set: <! echo "Cookie named '" . $cookie_name . "' is not set!"; } else { echo "​Cookie '" . IF(logical_test, value_if_true, value_if_false) In IF statement to evaluate whether the cell is Blank or Not Blank, you can use either of the following approaches; Logical expressions Equal to Blank (=””) or Not Equal to Blank (<>””) ISBLANK function to check blank or null values. If a cell is blank, then it returns TRUE, else returns


PHP isset() function, The isset() function return false if testing variable contains a NULL value. $_​COOKIE: An associative array of variables passed to the current  If the value argument is an empty string, or FALSE, and all other arguments match a previous call to setcookie, then the cookie with the specified name will be deleted from the remote client. This is internally achieved by setting value to 'deleted' and expiration time to one year in past.


Constructing Usable Web Menus, getTime () -10°365*24*60°60); and then set the cookie's value to an empty the cookie's been set by checking to see if it contains a non-empty, non-null value. the cookie was not set as expected";} // at this point, the cookie has been set, but it is not available in this script // the cookie will not be returned from the client to the server until the next http request // this is because the browser sends the cookie to our script before our script starts running echo '<pre>'; echo php_eol . '$_cookie