Html-php get form data

I have two php questions: add. php: {code ...} action. php: {code ...} why does the following error occur when submitting data: {code ...} not all namesexargeclassId are available. Why are they still undefined ?? I have two php questions
Where
Add. php:

Action. php:

Switch ($ _ GET ['action']) {case "add": $ name = $ _ POST ['name']; $ sex = $ _ POST ['sex ']; $ arge = $ _ POST ['arge']; $ classId = $ _ POST ['classid']; $ SQL = "insert into students VALUES (NULL, '{$ name}', '{$ sex}', '{$ arge}', '{$ classId }') "; $ rw = $ pdo-> exec ($ SQL); if ($ rw> 0) {echo" script alert ('added successfully'); window. location = 'index. php 'script ';} else {echo "script alert ('failed to add'); window. history. back (); script ";} break ;}

Why does the following error occur when submitting data:

Notice: Undefined index: name in /Applications/XAMPP/xamppfiles/htdocs/studentsManager/action.php on line 16Notice: Undefined index: sex in /Applications/XAMPP/xamppfiles/htdocs/studentsManager/action.php on line 17Notice: Undefined index: arge in /Applications/XAMPP/xamppfiles/htdocs/studentsManager/action.php on line 18Notice: Undefined index: classId in /Applications/XAMPP/xamppfiles/htdocs/studentsManager/action.php on line 19

Name sex arge classId? Why are there still undefined ??

Reply content:

I have two php questions
Where
Add. php:

Action. php:

Switch ($ _ GET ['action']) {case "add": $ name = $ _ POST ['name']; $ sex = $ _ POST ['sex ']; $ arge = $ _ POST ['arge']; $ classId = $ _ POST ['classid']; $ SQL = "insert into students VALUES (NULL, '{$ name}', '{$ sex}', '{$ arge}', '{$ classId }') "; $ rw = $ pdo-> exec ($ SQL); if ($ rw> 0) {echo" script alert ('added successfully'); window. location = 'index. php 'script ';} else {echo "script alert ('failed to add'); window. history. back (); script ";} break ;}

Why does the following error occur when submitting data:

Notice: Undefined index: name in /Applications/XAMPP/xamppfiles/htdocs/studentsManager/action.php on line 16Notice: Undefined index: sex in /Applications/XAMPP/xamppfiles/htdocs/studentsManager/action.php on line 17Notice: Undefined index: arge in /Applications/XAMPP/xamppfiles/htdocs/studentsManager/action.php on line 18Notice: Undefined index: classId in /Applications/XAMPP/xamppfiles/htdocs/studentsManager/action.php on line 19

Name sex arge classId? Why are there still undefined ??

The error behind you is that you open your own in the address baraction.php?action=addIs it displayed?
When you open youraction.php?action=addIt is requested in GET mode, and there is noPOSTSo at this time$_POST['xxx']PHP will haveNotice(When display is allowed ).

Normally from youradd.phpClick the button (when the page data is filled in). The problem you mentioned is not reported.

• -If the problem is not found, I find that the case can be used for the first time. Isn't it afraid of errors?

The encoding attribute is not set for form.

Encoding = 'application/x-www-form-urlencoded'

That's it. Var_dump ($ _ POST) first );