undefined offset PHP error

Question

I am receiving the following error in PHP     Notice undefined offset 1  in C  wamp www includes imdbgrabber php line 36   Here is the PHP code that causes it    lt  php         function get match  regex   content            preg match  regex  content  matches             return  matches 1      ERROR HAPPENS HERE     What does the error mean

User · Answer

Undefined offset error in PHP is Like  ArrayIndexOutOfBoundException  in Java   example    lt  php  arr array  Hello   world      0  gt Hello 1  gt world  echo  arr 2     gt    error  Undefined offset 2  It means you re referring to an array key that doesn t exist   Offset  refers to the integer key of a numeric array  and  index  refers to the string key of an associative array

User · Answer

Undefined offset means there s an empty array key for example    a   array  Felix   Jon   Java        This will result in an  Undefined offset  because the size of the array    is three  3   thus  0 1 2 without 3 echo  a 3     You can solve the problem using a loop  while     i   0  while   row   mysqli fetch assoc  result            Increase count by 1  thus   i 1      i          groupname  i    base64 decode base64 decode  row  groupname              Set the first position of the array to null or empty      groupname 0

User · Answer

How to reproduce this error in PHP   Create an empty array and ask for the value given a key like this   php gt   foobar   array     php gt  echo gettype  foobar   array  php gt  echo  foobar 0    PHP Notice   Undefined offset  0 in   usr local lib python2 7 dist-packages phpsh phpsh php 578     eval   d code on line 1   What happened   You asked an array to give you the value given a key that it does not contain   It will give you the value NULL then put the above error in the errorlog   It looked for your key in the array  and found undefined     How to make the error not happen   Ask if the key exists first before you go asking for its value   php gt  echo array key exists 0   foobar     false  1   If the key exists  then get the value  if it doesn t exist  no need to query for its value

User · Answer

If preg match did not find a match   matches is an empty array  So you should check if preg match found an match before accessing  matches 0   for example   function get match  regex  content        if  preg match  regex  content  matches             return  matches 0         else           return null

[php] undefined offset PHP error

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