PHP学习札记(二)
PHP学习笔记(二)
PHP 的 $_GET 和 $_POST 用于检索表单中的值,比如用户输入。
表单实例:
当用户填写该表单并提交按钮时,表单的数据会被送往"welconme.php"文件中
"welcome.php"文件类似这样:
Welcome .
You are years old.
$_GET 变量是一个数组,内容是由 HTTP GET 方法发送的变量名称和值
$_GET 变量用于收集来自 method="get" 的表单中的值。从带有 GET 方法的表单发送的信息,对任何人都是可见的(会显示在浏览器的地址栏),并且对发送的信息量也有限制(最多 100 个字符)。
"welcome.php" 文件现在可以通过 $_GET 变量来获取表单数据了并且表单域的名称会自动成为 $_GET 数组中的 ID 键:
注意:在使用 $_GET 变量时,所有的变量名和值都会显示在 URL 中。所以在发送密码或其他敏感信息时,不应该使用这个方法。不过,正因为变量显示在 URL 中,因此可以在收藏夹中收藏该页面。在某些情况下,这是很有用的。
HTTP GET 方法不适合大型的变量值;值是不能超过 100 个字符的。
PHP 的 $_REQUEST 变量包含了 $_GET, $_POST 以及 $_COOKIE 的内容。
PHP 的 $_REQUEST 变量可用来取得通过 GET 和 POST 方法发送的表单数据的结果。
$_POST 变量用于收集来自 method="post" 的表单中的值。从带有 POST 方法的表单发送的信息,对任何人都是不可见的(不会显示在浏览器的地址栏),并且对发送信息的量也没有限制。

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