See this page for an explanation of quotes inside array brackets:

Basically, the correct way to do it is to _always_ use quotes (single
quotes for strings without variables, and double quotes for strings with
variables).  So your example below should use format #2 since there are no
variables to expand.  Format #1 below is deprecated, and I can attest to
weird behavior when you use $row[$column_name] without double quotes.  
Hope this helps!

Daniel Ems

On Thu, 7 Feb 2002, B. Verbeek wrote:
> Hello,
> What's the difference between:
>     1.- $row[column_name];
>     2.- $row['column_name'];
>     3.- $row["column_name"];
> ?
> ragards Bart

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