stripos returns false when special characters is used

Question

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.

score 9 · Accepted Answer · answered Mar 30 '11 at 14:51

9

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.

answered Mar 30 '11 at 14:51

Marc B

356,200
43
426
500

Why oh why is this function not stated as a related function to stripos... Then I would have been able to find out myself. Thanks for the help. – foens Mar 30 '11 at 15:12
1

You can suggest it to the PHP documentation maintainers. Those doc pages aren't frozen for all eternity. – Marc B Mar 30 '11 at 16:13

score 3 · Answer 2 · answered Mar 30 '11 at 14:51

3

You need mb_stripos.

answered Mar 30 '11 at 14:51

awm

6,526
25
24

As much as I would like to accept both yours and Marc B's answer, I selected his since an explanation accompanied his answer. – foens Mar 30 '11 at 15:11

score 1 · Answer 3 · answered Jun 15 '15 at 02:21

1

As the other solutions say, try first with mb_stripos(). But if using this function doesn't help, check the encoding of your php file. Convert it to UTF-8 and save it. That did the trick for me after hours of research.

answered Jun 15 '15 at 02:21

Guscie

2,278
2
26
33

score 1 · Answer 4 · answered Mar 30 '11 at 14:54

1

mb_stripos will take care of this.

answered Mar 30 '11 at 14:54

k to the z

3,217
2
27
41

stripos returns false when special characters is used

4 Answers4

Linked

Related