PHP $_GET variable

We already knew when we were studying that the $_GET variable is used to collect values from the form with method="get".

$_GET Variable

The predefined $_GET variable is used to collect values from the form with method="get".

The information sent from a form with the GET method is visible to anyone (will be displayed in the browser's address bar), and there is a limit on the amount of information sent.

Let’s use an example to illustrate:

Example

<html>
 <head>
     <meta charset="utf-8">
     <title>php中文网(php.cn)</title>
 </head>
 <body>
 
 <form action="php_get.php" method="get">
     名字: <input type="text" name="name"><br>
     性别：<input type="radio" name="sex" value="男" checked>男
     <input type="radio" name="sex" value="女">女<br>
     年龄: <input type="text" name="age"><br>
     <input type="submit" value="提交">
 </form>
 
 </body>
 </html>

Submit to php_get.php page

<?php
 header("Content-type:text/html;charset=utf-8");    //设置编码
 echo "你的姓名是：" .$_GET['name'] ."<br/>";
 echo "你的性别是："  .$_GET['sex']."<br/>";
 echo "你的年龄是：".$_GET['age'];
 ?>

Program running result:

We found that the values we filled in the form are all displayed in the Url column

When to use method="get"?

When using method="get" in an HTML form, all variable names and values will be displayed in the URL.

Note: So this method should not be used when sending passwords or other sensitive information!

However, because the variable appears in the URL, it is possible to bookmark the page. In some cases this is useful.

Note: The HTTP GET method is not suitable for large variable values. Its value cannot exceed 2000 characters.

Continuing Learning

new file

<html> <head> <meta charset="utf-8"> <title>php中文网(php.cn)</title> </head> <body> <form action="php_get.php" method="get"> 名字: <input type="text" name="name"><br> 性别：<input type="radio" name="sex" value="男" checked>男 <input type="radio" name="sex" value="女">女<br> 年龄: <input type="text" name="age"><br> <input type="submit" value="提交"> </form> </body> </html>

submit Reset Code

Automatic operation