Ask a question »

Notice: Undefined index

November 2015

PHP is one of the favorite scripting language tools amongst Webmasters. However at times a user may come across an "undefined index" error message. This error is mainly due to improper variable settings. While recovering variables from a user-filled form, an error may occur. Usually in PHP $_POST and $_GET commands are used to retrieve values that are indicated in a form. While using these functions you may come across this Notice: Undefined index message. To get rid of this error make sure that the table field is set to isset () function, which determines whether a certain value has already been declared by PHP. This error message can be postponed before the configuration of the server. You can change the type of error reported using error_reporting function.

Notice: Undefined index

When trying to recover variables from your forms, if you use the $ _POST or $ _GET variables to recover your forms or otherwise, you may come across this error:

Notice: Undefined index in 'file path executing php' on line 'current line' 

To avoid this error, test whether the table fields was set with the function is set ().

Example for a variable $ _POST [ 'trick']:
/ / Before you use $ _POST [ 'trick']    
if (isset ($ _POST [ 'trick']))    
 / / Instructions if $ _POST [ 'trick'] exists    

This type of error is postponed prior to the configuration of the server.
It is not reported by default because it is not important, depending on the constant <gras>E_NOTICE

You can change the types of errors reported using the error_reporting.
For unlimited offline reading, you can download this article for free in PDF format:

See also

In the same category

Published by deri58. - Latest update by Virginia Parsons
This document entitled « Notice: Undefined index » from CCM ( is made available under the Creative Commons license. You can copy, modify copies of this page, under the conditions stipulated by the license, as this note appears clearly.