Notice Undefined offset 0 in

Question

I am getting this PHP error  what does it mean   Notice  Undefined offset  0 in  C  xampp htdocs mywebsite reddit vote tut src votes php on line 41   From this code    lt  php  include  config php      function getAllVotes  id           votes   array          q    SELECT   FROM entries WHERE id    id         r   mysql query  q        if mysql num rows  r   1   id found in the table                  row   mysql fetch assoc  r             votes 0     row  votes up              votes 1     row  votes down                return  votes       function getEffectiveVotes  id               votes   getAllVotes  id             effectiveVote    votes 0  -  votes 1        ERROR THROWN HERE         return  effectiveVote        id     POST  id      action     POST  action        get the current votes   cur votes   getAllVotes  id       ok  now update the votes   if  action   vote up     voting up           votes up    cur votes 0  1        AND ERROR THROWN HERE        q    UPDATE threads SET votes up    votes up WHERE id    id       elseif  action   vote down           votes down    cur votes 1  1        q    UPDATE threads SET votes down    votes down WHERE id    id         r   mysql query  q    if  r          effectiveVote   getEffectiveVotes  id        echo  effectiveVote   votes       elseif   r    voting failed         echo  Failed          gt

User · Answer

Use print r  votes   to inspect the array  votes  you will see that key 0 does not exist there   It will return NULL and throw that error

User · Answer

As explained it happens because there is no data in the  cur votes 0  and hence it throws an error    To ensure your code works fine  before performing   votes up    cur votes 0  1   echo the  cur votes 0  value to see if there is any value stored or not    Surely  there is no value stored

User · Answer

As you might have already about knew the error  This is due to trying to access the empty array or trying to access the value of empty key of array  In my project  I am dealing with this error with counting the array and displaying result   You can do it like this   if count  votes      0         echo  Sorry  no votes are available at the moment      else        do the stuff with votes     count  votes  counts the  votes array  If it is equal to zero  0   you can display your custom message or redirect to certain page else you can do stuff with  votes  In this way you can remove the Notice  Undefined offset  0 in notice in PHP

User · Answer

You are asking for the value at key 0 of  votes    It is an array that does not contain that key   The array  votes is not set  so when PHP is trying to access the key 0 of the array  it encounters an undefined offset for  0  and  1  and throws the error   If you have an array    votes   array  1   2   3      We can now access    votes 0    votes 1    votes 2     If we try and access    votes 3     We will get the error  Notice  Undefined offset  3

User · Answer

Use mysql row instead  mysql fetch row  r   Meanwhile consider using mysqli or PDO

User · Answer

If you leave out the brackets then PHP will assign the keys by default   Try this    votes    row  votes up      votes    row  votes down

User · Answer

If you are using dompdf dompdf and error occure in vendor dompdf dompdf src Cellmap php then It looks like we re using the wrong frame id in the update row group method  Initial testing seems to confirm this  Though that may be because this is strictly a paged table issue and not too many of the documents in my test bed have paged tables   Can you try changing line 800 to    r rows    this-  frames  g key   rows      g key instead of  r key   https   github com dompdf dompdf issues 1295

User · Answer

getAllVotes   isn t returning an array with the indexes 0 or 1  Make sure it s returning the data you want by calling var dump   on the result

User · Answer

its just a warning use   error reporting 0     it shows when we do not initialize array and direct assigning value to indexes   somefunction   raja 0   this    raja 1   that       instead     somefunction   raja array 0  gt  this  1  that      or  raja array  this   that        it just notification  do not generate any output error or any unexpected output

User · Answer

In my case it was a simple type    SESSION  role      ge     I was missing the correct closing bracket    SESSION  role       ge

User · Answer

first  check that the array actually exists  you could try something like   if  isset  votes           Do bad things to the votes array

User · Answer

I encountered this as well and the solution is simple  dont hardcode the array index position in your code   Instead of  data 0   somekey   do  foreach  data as  data item     echo  data item  somekey        If there is an array or more you can perform your desired action inside the loop  but if it s undefined it will not bring an error  you can also add other checks on top of that   You could also add a variable and increment it in a for in loop to limit your looping if you want only the first positions or something

User · Answer

function getEffectiveVotes  id     According to the function header  there is only one parameter variable   id   Thus  on line 27  the votes   array is undefined and out of scope  You need to add another parameter value to the function header so that function getEffectiveVotes   knows to expect two parameters  I m rusty  but something like this would work   function getEffectiveVotes  id   votes    I m not saying this is how it should be done  but you might want to research how PHP passes its arrays and decide if you need to explicitly state to pass it by reference  function getEffectiveVotes  id  amp  votes      lt ---I forget  no time to look it up right now    Lastly  call function getEffectiveVotes   with both arguments wherever it is supposed to be called   Cheers

User · Answer

This answer helped me https   stackoverflow com a 18880670 1821607 The reason of crush     index 0 wasn t set  Simple  array    array   array null  did the trick  Or you should check whether array element on index 0 is set via isset  array 0    The second variant is the best approach for me

[php] Notice: Undefined offset: 0 in

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