I am using the stripos function to check if a string is located inside another string, ignoring any cases.

Here is the problem:

stripos("ø", "Ø")

returns false. While

stripos("Ø", "Ø")

returns true.

As you might see, it looks like the function does NOT do a case-insensitive search in this case.

The function has the same problems with characters like Ææ and Åå. These are Danish characters. What is the problem and what can I do to fix it?

Accepted Answer

Use mb_stripos() instead. It's character set aware and will handle multi-byte character sets. stripos() is a holdover from the good old days when there was only ASCII and all chars were only 1 byte.

Written by Marc B
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