php - add new index to array without generating an 'undefined index' warning

Question

I am looping over an array,

if I spot an error in the array I am adding a key called error.

however I am getting a whole pile of 'undefined index 'error' warnings.

How can I do this without generating those warnings?

Code as requested

$csv = array();
if (($handle = fopen($filePath, "r")) !== FALSE) {
  while (($csv[] = fgetcsv($handle)) !== FALSE);
  fclose($handle);
}

foreach ($csv as &$row) {
  if (count($row) > $maxCols)
    $maxCols = count($row);

  if (count($row) == 0) {
    $errors++;
    $row['error'] = 'Empty Column!';
    continue;
  }
  //more code
}

Example of what $row would look like in the foreach()

Array (
[0] => 1
[1] => 12
[2] => 64273566141
[3] => bakery
[4] => 2009-12-08 09:07:39
[5] => 2009
[6] => 2009-12-08 09:08:35
[7] =>
[8] => 0 )

See? Full Size http://webspirited.com/proof.png

and no, I cant add an empty index when I create the array as it comes from fgetcsv — Hailwood
– Hailwood, Commented Feb 17, 2011 at 1:27
isset or array_key_exists are the usual solutions to this error, but code please, cause given what you are describing you shouldn't be getting this error unless i've misunderstood what you are asking — tobyodavies
– tobyodavies, Commented Feb 17, 2011 at 1:30
that code shouldn't produce an error... I think the error is more likely to be where you are checking for the error later (i.e. expand the //more code comment please) — tobyodavies
– tobyodavies, Commented Feb 17, 2011 at 1:33
Where is the E_NOTICE error occurring? In the //more code section? Nothing you have there would throw an undefined index error. — Phil
– Phil, Commented Feb 17, 2011 at 1:36

Phil · Accepted Answer · 2011-02-17 01:51:10Z

2

You're using == instead of =.

Using the comparison operator is attempting to fetch the potentially undefined array index. If $row['error'] has not been set previously, this will trigger an E_NOTICE undefined index error.

edited Feb 17, 2011 at 1:51

answered Feb 17, 2011 at 1:33

Phil

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2 Comments

Hailwood Over a year ago

nope, Im adding the error index to all 'rows' of the csv array that have errors. Please see my code above

Phil Over a year ago

@Hailwood Edited my answer given the new information in your question

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