Sessions and cookies in php
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Sessions in PHP allow storing user information to be used across multiple pages. A session is started with the session_start() function and session variables are set using the $_SESSION global array. Session variables last until the browser is closed by default. Cookies are small pieces of information stored in the client browser that are used to recognize the user. Cookies are created and saved on the client side but sent to the server with each request, allowing the server to access them through the $_COOKIE superglobal array. The main difference is that sessions last until the browser closes while cookies persist for a set time period or until deleted.
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Sessions and cookies in php
- 1. sessions and cookies in PHP
- 2. Sessions in php Session variables used to storing user information to be used across multiple pages e.g. username, password, ..etc By default, session variables last until the user closes the browser.
- 4. Php session_start() function A session is started with the session_start() function Session variables are set with the PHP global variable: $_SESSION PHP $_SESSION is an associative array that contains all session variables. session_start(); // for creating session $_SESSION["user"] = “abc"; //setting of session values echo $_SESSION["user"]; //get or printing session values
- 5. session_destroy() in php PHP session_destroy() function is used to destroy all session variables completely. //Example c.php <?php session_start(); session_destroy(); ?>
- 6. Example for Session // Abc.php <?php session_start(); //creation of session ?> <html> <body> <?php $_SESSION["user"] = “pavan"; //setting session value echo "Session information are set successfully.<br/> "; ?> <a href=“cs.php">Visit next page</a> </body> </html> // cs.php <?php session_start(); ?> <html> <body> <?php echo "User is: ".$_SESSION["user"]; ?> </body> </html>
- 7. Cookies in php PHP cookie is a small piece of information which is stored at client browser. It is used to recognize the user. Cookie is created at server side and saved to client browser. Each time when client sends request to the server, cookie is embedded with request. In that way cookie can be received at the server side.
- 9. setcookie() function setcookie() function is used to set cookie with HTTP response. Once cookie is set, you can access it by $_COOKIE superglobal variable. <?php $cookie_name = "user"; $cookie_value = "John Doe"; setcookie($cookie_name, $cookie_value, time() + (86400 * 30), "/"); // 86400 = 1 day ?>
- 10. Example For COOKIES <?php setcookie("user", “aaa"); ?> <html> <body> <?php if(!isset($_COOKIE["user"])) { echo "Sorry, cookie is not found!"; } else { echo "<br/>Cookie Value: " . $_COOKIE["user"]; } ?> </body>
- 11. Difference b/w session and cookies