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PHP学习札记（四）cookie

WBOYOriginal: 2016-06-13 13:02:41876browse

PHP学习笔记（四）cookie
1.setcookie() 函数用于设置 cookie
setcookie(name, value, expire, path, domain);
cookie常用于识别用户。setcookie() 函数必须位于标签之前。

2.$_COOKIE取回cookie的值

3.isset()函数来确认是否已设置了 cookie

<html>
<body>
<?php
if (isset($_COOKIE["user"]))
{
  // Print a cookie
  echo $_COOKIE["user"];
  // A way to view all cookies
  print_r($_COOKIE);
}
else
  echo "Welcome guest!<br />";
?>
</body>
</html>

4.cookie删除

<?php 
// set the expiration date to one hour ago
setcookie("user", "", time()-3600);
?>

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