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sorting - Sort array items in PHP so that it is not case sensitive to letters

When I use sort($topics) I get something along the lines of:

  1. Apple
  2. Green
  3. Zebra
  4. grass

In this example, "grass" starts with a lower case g but ends up after "Zebra" which has a capital letter.

How do I make it so that it sorts it where it ignores whether the word starts with capitals or not?

  1. Apple
  2. Green
  3. grass
  4. Zebra
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Call usort() as usort($topics, 'strnatcasecmp').

strcasecmp would do the job, too, but strnatcasecmp will also sort properly when you have numbers in your string.


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