Undefined offset while accessing array element which exists

Question

I have an array and PHP and when I print it out I can see the values I need to access, but when I try accessing them by their key I am getting a PHP Notice. I printed the ar

Answer 1

I've just found this bug which causes array elements to be inaccessible sometimes in PHP when the array is created by a call to unserialize.

Create a test PHP file containing (or run from the command line) the following script:

<?php 

$a = unserialize('a:2:{s:2:"10";i:1;s:2:"01";i:2;}'); 

print $a['10']."\n";

$a['10'] = 3; 
$a['01'] = 4; 

print_r($a);

foreach ($a as $k => $v) 
{ 
  print 'KEY: '; 
  var_dump($k); 
  print 'VAL: '; 
  var_dump($v); 
  print "\n"; 
}

If you get errors you have a version of PHP with this bug in it and I recommend upgrading to PHP 5.3