PHP Undefined Index

Question

This is going to sound really stupid  but I cannot figure out why I am getting this error   I have created a selection box  named  query age  in my html form    lt form method  get  action  user list php  gt   lt select name  query age  gt     lt option value    gt Doesn t matter lt  option gt     lt option value  between 18 and 30  gt 18 - 30 lt  option gt     lt option value  between 31 and 40  gt 31 - 40 lt  option gt     lt option value  between 41 and 50  gt 41 - 50 lt  option gt     lt option value  between 51 and 60  gt 51 - 60 lt  option gt     lt option value  between 61 and 70  gt 61 - 70 lt  option gt     lt option value  between 71 and 80  gt 71 - 80 lt  option gt     lt option value  between 81 and 90  gt 81 - 90 lt  option gt     lt option value   gt  90  gt Older than 90 lt  option gt   lt  select gt    In the corresponding php form  I have    query age     GET  query age      When I run the page  I get this error      Notice  Undefined index  query age in index php on line 19   I don t understand why this is happening  and I d love to know how to make it go away

User · Accepted Answer

I don t see php file  but that could be that - replace in your php file    query age     GET  query age      with    query age    isset   GET  query age        GET  query age     null     Most probably  at first time you running your script without  query age  something  and   GET has no key like query age

User · Answer

if you use isset like the answer posted already by singles  just make sure there is a bracket at the end like so    query age    isset   GET  query age        GET  query age     null

User · Answer

The first time you run the page  the query age index doesn t exist because it hasn t been sent over from the form   When you submit the form it will then exist  and it won t complain about it    so change   GET  query age     to    empty   GET  query age        GET  query age     null

User · Answer

The checking of the presence of the member before assigning it is  in my opinion  quite ugly   Kohana has a useful function to make selecting parameters simple   You can make your own like so     function arrayGet  array   key   default   NULL        return isset  array  key      array  key     default      And then do something like      page   arrayGet   GET   p   1

[php] PHP Undefined Index

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