PHP example code: Determine whether the Form form is submitted_PHP tutorial

　Agni Website Building Academy (Bkjia.Com) PHP Programming Today I will introduce an article about PHP judging whether the Form form is submitted. Before A few days ago, I saw a friend asking this question on the webmaster Q&A forum, and then someone gave an example code. The code is as follows:

以下为引用的内容：
$action=$HTTP_POST_VARS["Button1"];
if($action=="提交") {
//执行表单操作
} else {
//读取默认值
}
?>  

In fact, the above code is a bit complicated and can be simplified to:

The following is the quoted content:

以下为引用的内容：
if(isset($HTTP_POST_VARS["Button1"])) {
//执行表单操作
} else {
//读取默认值
}
?>  

if (isset($HTTP_POST_VARS["Button1"])) {

//Perform form operation

} else {

//Read default value }  ?>

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LieHuo.Net PHP Programming Today I will introduce an article about PHP judging whether the Form form is submitted. , I saw a friend asking this question in the webmaster Q&A forum a few days ago, and then...