In PHP, "$_GET" means to obtain GET data. It is a predefined variable and is mainly used to receive form data submitted using the GET method in the form form. The data structure of the "$_GET" variable is an associative array. The key of the array is the value of the form element name, and the value of the array is the value of the corresponding form.
The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer
In php, the meaning of "$_GET" To obtain GET data, it is a predefined variable, mainly used to receive form data submitted using the GET method in the form form. The GET method is the default method for the method attribute in the form. Form data submitted using the GET method is appended to the URL and sent to the server as part of the URL.
During the development process of the program, since the data submitted by the GET method is attached to the URL and sent, information of the type "Parameters passed by the URL user" will be displayed in the address bar of the URL, as follows: Representation:
http://url?name1=value1&name2=value2 ...
Among them, url is the form response address (such as http://c.biancheng.net), name1 and name2 are the names of the form elements, and value1 and value2 are the values of the form elements. The URL and form elements are separated by "?", and multiple form elements are separated by "&". The format of each form element is "name=value", which is fixed.
Since different browsers have different restrictions on the length of the URL, when using the GET method to submit data, you must pay attention to the size of the data. If the length of the data exceeds the browser limit, the data will be truncated, resulting in data loss. The restrictions on URL length by mainstream browsers are as shown in the following table:
$_GET global variable has a similar structure to $_POST. Its data structure is an associative array. The key of the array is the value of the form element name. The value is the value of the corresponding form. $_GET can not only obtain form data, but also all parameters in the URL can be obtained using $_GET.
Another thing to note is: when using $_POST or $_GET to obtain form data in PHP, it is case-sensitive, so you should be careful not to ignore the case of letters during the development process.
[Example] The content of the form tag in the user.html file below is the simplest form
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>表单提交</title> </head> <body> <form action="user.php" method=""> 用户名: <input type="text" name="user"> <br><br> 密 码: <input type="password" name="pwd"> <br><br> 生 日: <input type="date" name="bday"><br><br> <input type="submit" value="提交数据"> </form> </body> </html>
Let’s add the form of the user.html file and look at the address bar of the URL
You can directly use the predefined variable $_GET in the user.php file to obtain data. $_GET The global variable is An associative array, the key of the array is the value of the form element name, and the value of the array is the value of the corresponding form. (Note that all parameters in the URL can be obtained using $_GET.)
<?php
header("content-type:text/html;charset=utf-8");
echo "用户名为：".$_GET['user']."<br>生日为：".$_GET['bday'];
?>
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