PHP4 's Cookie support detailed
The establishment of commercial sites or more sophisticated personal sites, often need to record visitors ' information, in PHP provides two convenient means: Session and Cookie function. In order to permanently maintain user information, Cookies are the most convenient means. Here I will give you a detailed explanation of the function of the cookie and how to use it.
One: Set cookies
Cookies must be set before using cookies.
function prototypes: int Setcookie (string name,string value,int expire,string path,string domain,int Secure)
All parameters, except name, are optional and can be represented by an empty string.
Property value: Used to specify a value.
Property path: Used to specify which directory path the cookie is sent to the server.
Attribute domain: Ability to limit the sending of cookies on the browser side.
Expire parameter: Used to specify the effective time of the cookie, which is a standard Unix time stamp.
You can use the time () or the mktime () function to obtain the unit in seconds.
Secure parameter: Indicates whether this cookie is transmitted over the network via an encrypted HTTPS protocol.
Two: Precautions when setting cookies
Setting cookies on the same page is actually done in a backward-forward order. If you want to delete a cookie before writing a cookie, you must write the statement and then write the DELETE statement. Otherwise, an error occurs.
Three: setcookie Example
Simple: Setcookie ("MyCookie", "Value_of_mycookie");
With Expiration: Setcookie ("Withexpire", "Expire_in_1_hour", Time () +3600);
Everything: Setcookie ("Fullcookie", "Full_cookie_value", time+3600, "/forum", "www.123.com", 1);
IV: Some features of cookies
Cookies are path-oriented. When the default Path property is used, the Web server page automatically passes the current path to the browser. Specifying a path forces the server to use the path of the setting.
Cookies placed on one directory page are not visible on the page of another directory.
V: Receive and process cookies
PHP's handling of cookies is fully automated, as is the case with the form variables. Of course, you can also use PHP global variables, $HTTP _cookie_vars arrays.
Example: Echo $mycookie;
echo $cookie array[0];
echo Count ($cookie Array);
echo $HTTP _cookie_vars["MyCookie"];
VI: Delete Cookies
(1) Call Setcookie () with the name parameter only;
(2) to make the expiry time () or time-1;
Seven: Restrictions on the use of cookies
(1) must be set before the content output of the HTML file;
(2) Different browser to the cookie processing inconsistent, must be considered when using;
(3) client-side restrictions, such as user settings prohibit cookies, the cookie can not be established;
Eight: A specific example, I hope you have a more profound understanding of cookies
cookie.php
if (!isset ($flag))
{
Setcookie ("MyCookie", "This My cookie!");
Header ("location:cookie.php?flag=1");
Exit
}
?>
echo "Cookies are:". $mycookie;
?>
How about, through the above introduction, you do not have a detailed understanding of the cookie function in PHP. Use your intelligence to make your site more powerful. Please contact fbigov@sina.com If you have any questions. Let's make progress together.
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