php - Accessing $_POST variables cause errors -

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I was wondering if you could help me with the following:

A form on the next page. I am using the $ _ POST method. Although the information is visible in the browser, when checking the code shows an notification: the undefined index error and the value of that value There is no mark where it should be (in the code). I think it is related to the above error.

The way I am calling it is for the former: 

  $ name = $ _POST ['name']; Besides this, I am trying to get the same information in a hidden area so that to store them in a database (after viewing the page) here but here no one Even the values ​​could not be passed. The value in the hidden is empty.  
 Sorry if this is a silly thing ... but at stake and I do not know what I'm doing is wrong. Thank you very much for any help. Francisco   
 
 
 In PHP you can not read the variable which Does not exist. For non-existing simplified variables such as  $ foo  or  $ bar  you will get an  unchanging variable  notice, such as non-current array index such as  $ Array ['foo']  or  $ array ['bar']  gives you an  undefined index  notice and non-current object properties such as  $ item - & gt; Foo  or  $ object-> Bar  you will notice  undefined properties  
 
 The reason for this is that PHP variables should be declared before reading-entry can be done. The function in PHP is to test if a variable exists, for array and for object properties. Apart from this,  isset  is a universal tool for testing the existence. (Note that the value  null  is not equal to current.) 
 
 So in your case, you should check that if  $ _ POST ['name']  Exists before trying to read it: 
 
  if (array_key_exists ($ _ POST, 'name')) {$ name = $ _POST ['name']; } // if (isset ($ _ POST ['name']) {$ name = $ _POST ['name'];}  
 
 but note that the  $ name  now depends on the existence of  $ _ POST ['name'] .

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