PHP determines whether cookies are supported

PHP transparently supports HTTP cookies. A cookie is a mechanism that stores data on a remote browser to track and identify users. Cookies can be set using the setcookie() or setrawcookie() functions.

Cookie is part of the HTTP header, so the setcookie() function must be called before other information is output to the browser, which is the same as the header() function The restrictions are similar. You can use the output buffer function to delay the output of the script until all cookies or other HTTP headers have been set as required. (Recommended learning: PHP Video Tutorial)

If "C" is included in variables_order, any cookie sent from the client will be automatically included in the $_COOKIE automatic global array. If you want to set multiple values ​​for a cookie variable, you need to add the [] symbol after the cookie name.

According to the setting of register_globals, ordinary PHP variables can be created from cookies. However, relying on this feature is not recommended as this option is usually turned off for security reasons.

Setting new cookie
=============================
<?php
setcookie("name","value",time()+$int);
/*name is your cookie&#39;s name
value is cookie&#39;s value
$int is time of cookie expires*/
?>

Getting Cookie
=============================
<?php
echo $_COOKIE["your cookie name"];
?>

Updating Cookie
=============================
<?php
setcookie("color","red");
echo $_COOKIE["color"];
/*color is red*/
/* your codes and functions*/
setcookie("color","blue");
echo $_COOKIE["color"];
/*new color is blue*/
?>

Deleting Cookie
==============================
<?php
unset($_COOKIE["yourcookie"]);
/*Or*/
setcookie("yourcookie","yourvalue",time()-1);
/*it expired so it&#39;s deleted*/
?>

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