Sort array elements in PHP so that it is not case sensitive

Question

When I use sort($topics) , I get something line by line:

• Apple
• Green
• Zebra
• grass

In this example, grass begins with lowercase g, but ends after Zebra, which has a capital letter.

How to make it sort it where it ignores, does the word begin with capital or not?

• Apple
• Green
• grass
• Zebra

Answer 1

Call usort() as usort($topics, 'strnatcasecmp') .

strcasecmp will do the job too, but strnatcasecmp will also sort correctly when you have numbers on your line.

Answer 2

There is natcasesort .

 natcasesort($topics);