Compare two strings PHP

Question

I need compare two string. Visually they compare, but var_dump result other. Help me please.

string(8) "СИ.pdf" string(7) "CИ.pdf"

How correct compare him?

Most likely the strings are in different encoding. You will have to find out why that is, so that you can prevent such thing in future. Do _not_ search for some automatic encoding conversion, _that will not work_. Use a `hexeditor` if you want to understand what you see. — arkascha, Mar 26 '17 at 10:20
you have to [`setlocale`](http://php.net/manual/en/function.setlocale.php) — Deadooshka, Mar 26 '17 at 10:26

score 1 · Accepted Answer · answered Mar 26 '17 at 10:22

1

Use mb_convert_encoding() to convert both versions to something reasonable (UTF8 for example) then use mb_strstr() to do the comparison.

answered Mar 26 '17 at 10:22

mayersdesign

Thx! mb_convert_encoding($fileName) === mb_convert_encoding($item->getName()) work for me – Maksim Borodov Mar 26 '17 at 10:26
1

it is bad answer – Deadooshka Mar 26 '17 at 10:30
Really? Why? It worked for the OP. Do you have something better to suggest? – mayersdesign Mar 26 '17 at 10:34
As given they're already UTF-8, they're just using different code points that happen to look similar. – user3942918 Mar 26 '17 at 10:46

user3942918 · Answer 2 · 2017-03-26T10:54:43.327

Your first string, "СИ.pdf", uses the Cyrillic capital letter Es while the second, "CИ.pdf", has the Latin capital letter C. These are homoglyphs, and a way to check for them is to use Spoofchecker::areConfusable(), e.g.

$a = "СИ.pdf";
$b = "CИ.pdf";

var_dump(
    $a === $b,
    (new Spoofchecker())->areConfusable($a, $b)
);

Outputs:

bool(false)
bool(true)

Spoofchecker is from PHP's intl extension which is a wrapper for the ICU library. ICU's spoof checking is based on Unicode Technical Report #36 and Unicode Technical Standard #39.

score -1 · Answer 3 · edited May 23 '17 at 11:46

-1

most likely there are some non printable characters in the string

edited May 23 '17 at 11:46

Community

answered Mar 26 '17 at 10:24

Arie

3 Answers3