Php5Cookie and Session usage differences and examples

Php5Cookie and Session usage differences and examples

SetCookie ("Cookie", "cookievalue", time () + 3600, "/forum", ".jbxue.com", 1 ); 1) CookiePHP supports Cookie receiving and processing very well and is completely automatic. it is as simple as the FORM variable principle. For example, if you set a Cookie named MyCookier, PHP will automatically analyze it from the HTTP header received by the WEB server and form a variable named $ myCookie, which is the same as a common variable, the value of this variable is the Cookie value. Arrays also apply. Another method is to reference the global variable $ HTTP_COOKIE_VARS array of PHP. Examples are as follows: (assuming these are all set in the previous page and still valid) Echo $ MyCookie; Echo $ CookieArray [0]; Echo $ _ COOKIE ["MyCookie"]; Echo $ HTTP_COOKIE_VARS ["MyCookie"]; ?> 2) There are two ways to delete an existing Cookie: 1. SetCookie ("Cookie ",""); 2. SetCookie ("Cookie", "value", time ()-1/time ()); 3) restrictions on the use of cookies 1. it must be set before the HTML file content is output; 2. inconsistent processing of cookies by different browsers and sometimes incorrect results may occur. 3. restrictions are imposed on the client. A browser can create a maximum of 30 cookies, each of which cannot exceed 4 kB. each WEB site can set a maximum of 20 cookies. 3,Session configuration and application Session_start (); // initialize the session. it must be in the file header. $ _ SESSION [name] = value; // Configure Seeeion Echo $ _ SESSION [name]; // use session Isset ($ _ SESSION [name]); // judge Unset ($ _ SESSION [name]); // delete Session_destroy (); // consume all sessions ?> Note: session_register (), session_unregister, and session_is_registered are no longer used in php5. 1. cookie usage example If ($ _ GET ['out']) {// Used to cancel cookies Setcookie ('id ',""); Setcookie ('pass ',""); Echo "script" location. href = 'login. php 'script '; // because cookies do not take effect immediately, they only take effect when you refresh again. Therefore, after cancellation, the page is automatically refreshed. } If ($ _ POST ['name'] & $ _ POST ['password']) // if the variable username and password exist, set cookies below {// Used to set cookies Setcookie ('id', $ _ POST ['name'], time () + 3600 ); Setcookie ('pass', $ _ POST ['password'], time () + 3600 ); Echo "script location. href = 'login. php' script"; // enables cookies to take effect immediately } If ($ _ COOKIE ['id'] & $ _ COOKIE ['pass']) {// When cookies are successfully set, they are used to display cookies Echo "logon successful! Username: ". $ _ COOKIE ['id']." Password: ". $ _ COOKIE ['pass']; Echo" "; Echo "cancel cookies"; // double quotation marks. if there are quotation marks, use single quotation marks. } ?> 2. session usage example // Session usage instance Session_start (); // start the session, which must be placed in the first sentence; otherwise, an error occurs. If ($ _ GET ['out']) { Unset ($ _ SESSION ['id']); Unset ($ _ SESSION ['pass']); } If ($ _ POST ['name'] & $ _ POST ['password']) { // Set the session $ _ SESSION ['id'] = $ _ POST ['name']; $ _ SESSION ['pass'] = $ _ POST ['password']; } If ($ _ SESSION ['id'] & $ _ SESSION ['pass']) { Echo "logon successful! User id: ". $ _ SESSION ['id']." User password: ". $ _ SESSION ['pass']; Echo" "; Echo "deregistering a session "; } ?>