Saving State with Query Strings in PHP A query string is used to pass small amounts of data between browser requests. Common uses of query strings are: Remembering a user’s entered keywords when using a search function. Identifying which topic within a forum to display to the user. Specifying which post within a blog to …
Building Query Strings in PHP Query strings are not limited to form data. Query string is simply a string of characters stored in a URL, a user can manually create a URL containing a query string in the PHP script, and then include the URL as a link within the displayed page or in an …
Accessing Data in Query Strings in PHP To access the field names and values in a query string you simply use the $_GET superglobal array function. Syntax $firstName = $_GET[“firstName”]; Example Here, we will illustrate an example which displays a sequence of Square numbers. Save the script as number_squaring.php in the document root folder, and run it …
Working with Cookies in PHP Cookies allow users to store a small amount of data, not more than 4KB within the user’s browser itself. Then, whenever the browser requests a page on the Web site, all the data in the cookie is automatically sent to the server within the request. This means that when a …
Cookie Components in PHP A cookie is sent from the server to the browser as part of the HTTP headers. Here we will illustrate an example of an HTTP header to create a cookie: Set-Cookie: fontSize=3; expires=saturday, 9-May-2015 17:53:08 GMT; path=/; domain=.example.com; HttpOnly Here, we will describe you all the information contained in the cookie. …
Setting a Cookie in PHP PHP provides a built – in function, setcookie() , that can send the appropriate HTTP header to create the cookie on the browser. Here, you will learn how to set a cookie. You should always call setcookie() before sending any output to the browser. This is because setcookie() needs to …
Accessing Cookies Scripts In PHP To Access cookies in PHP is very easy: A user can simply read values from the $_COOKIE superglobal array. To display the pageViews cookie set use : echo $_COOKIE[“pageViews”]; // Displays “8” As with $_GET and $_POST , in a real – world situation you should not directly output data …
Removing Cookies In PHP If a user no longer needs a cookie that is stored on the user’s browser, then a user can instruct the browser to delete it. To delete a cookie, a user has to call setcookie() with the cookie name and any value (such as an empty string), and pass in an …
Although cookies are a useful way to store data but they have some problems like Firstly, they are not very secure. As with form data and query strings, an attacker can easily modify a cookie’s contents to insert data that could potentially break the application or compromise security. Secondly, a user can store a fair …
PHP Session new session, this function generates a unique SID for the session and sends it to the browser as a cookie called PHPSESSID (by default). However, if the browser has sent a PHPSESSID cookie to the server because a session already exists, session_start() uses this existing session: session_start();
Working with session data in PHP is also simple. A user can store all the session data as keys and values in the $_SESSION[] superglobal array. So a user might store the user’s first name using: $_SESSION[“firstName”] = “Aman”; Then display the user’s first name in the same page request or during a later request …
As earlier you have read that by default PHP sessions are automatically deleted when users quit their browser, because the PHPSESSID cookie ’ s expires field is set to zero. However, sometimes a user might want to destroy a session immediately. For example, if a shopper has checked out and placed an order via your …