How to fix Notice Undefined index in PHP form action

Question

I received the following error message when I tried to submit the content to my form  How may I fix it      Notice  Undefined index  filename in D  wamp www update php on line 4   Example Update php code    lt  php       index   1       filename     POST  filename         echo  filename    gt    And   POST  filename   comes from another page    lt  php      db   substr  string 0  14          substr  string 1  14      db txt     gt    lt input type  hidden  name  filename  value   lt  php echo  db    gt   gt

User · Answer

use isset for this purpose   lt  php    index   1   if isset   POST  filename             filename     POST  filename         echo  filename

User · Answer

Assuming you only copy pasted the relevant code and your form includes  lt form method  POST  gt      if isset   POST  filename           filename     POST  filename      if isset  filename         echo  filename      If  POST is not set the filename variable won t be either in the above example   An alternative way    filename   false  if isset   POST  filename           filename     POST  filename            echo  filename    guarenteed to be set so isset not needed   In this example filename is set regardless of the situation with  POST  This should demonstrate the use of isset nicely   More information here  http   php net manual en function isset php

User · Answer

Use empty   to check if it is available  Try with -  will generate the error if host is not present  here  if  empty   GET  host     if   GET  host

User · Answer

if isset   POST  form field name            variable name     POST  form field name

User · Answer

enctype  multipart form-data    Check your enctype in the form before submitting

User · Answer

short way  you can use Ternary Operators   filename    empty   POST  filename      POST  filename    -

User · Answer

if  empty   POST  filename       filename     POST  filename     echo  filename

User · Answer

Change   POST to   FILES and make sure your enctype is  multipart form-data   Is your input field actually in a form    lt form method  POST  action  update php  gt       lt input type  hidden  name  filename  value  test    gt   lt  form gt

User · Answer

Simply   if isset   POST  filename        filename     POST  filename     echo  filename    else   echo  POST filename is not assigned

User · Answer

Please try this  error reporting   E ALL  amp   E NOTICE  in php ini

[php] How to fix 'Notice: Undefined index:' in PHP form action

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