PHP: How to split a UTF-8 string?

Question

I have the following code which is not working with UTF-8 characters. How can I fix it?

$seed = preg_split('//u', $seed, -1, PREG_SPLIT_NO_EMPTY);
$seed = str_split('АБВГДЕЖЗ'); // and any other characters

shuffle($seed); // probably optional since array_is randomized; this may be redundant
$code = '';
foreach (array_rand($seed, 5) as $k) $md5_hash .= $seed[$k];

//We don't need a 32 character long string so we trim it down to 5 
$security_code = $code;

I have tried this code:

$seed = preg_split('//u', $seed, -1, PREG_SPLIT_NO_EMPTY);

but it is still not working.

When I enter `PHP str_split UTF-8` into Google, I get a *very* good result on the #1 position. — Pekka, Feb 08 '14 at 23:23

score 14 · Answer 1 · answered Feb 09 '14 at 01:42

14

You must create the variable $seed and give it a string value before you can use it as the second parameter of preg_split:

$seed = 'АБВГДЕЖЗ';
$seed = preg_split('//u', $seed, -1, PREG_SPLIT_NO_EMPTY);

The output of print_r($seed) will be:

Array
(
    [0] => А
    [1] => Б
    [2] => В
    [3] => Г
    [4] => Д
    [5] => Е
    [6] => Ж
    [7] => З
)

I hope the rest of your code will work just fine.

answered Feb 09 '14 at 01:42

Sharanya Dutta

3,981
2
17
27

It is not necessary to pass string into `preg_split` as variable. Function does not require this. It can be string to. – oleksii.svarychevskyi Feb 09 '14 at 19:53

oleksii.svarychevskyi · Answer 2 · 2014-02-09T19:50:33.707

1

For working with UTF-8 strings use Multibyte String Functions.

For your purpose it will be mb_split.

Update

$seed = preg_split('//u', 'abcdefghijklmnopqrstuvwxyz', -1, PREG_SPLIT_NO_EMPTY);
foreach (array_rand($seed, 5) as $k) {
    $md5_hash .= $seed[$k];
}

edited Feb 09 '14 at 19:50

answered Feb 08 '14 at 23:27

oleksii.svarychevskyi

1,106
8
13

Thanks, but this not working $seed = mb_split('АБВГДЕЖЗ'); // and any other characters – user3288430 Feb 08 '14 at 23:28
Do your have php module extension=php_mbstring.dll enabled? – oleksii.svarychevskyi Feb 08 '14 at 23:40
Yes. I don't understand how the code with this function has to look. – user3288430 Feb 08 '14 at 23:46
Something like this `mb_split("\s", "hello world")` – oleksii.svarychevskyi Feb 08 '14 at 23:55
In your case it should be mb_split("//", "АБВГДЕЖЗ") – oleksii.svarychevskyi Feb 08 '14 at 23:57
Now not working (thanks for you help!): `$seed = mb_split('//', 'abcdefghijklmnopqrstuvwxyz'); // and any other characters shuffle($seed); // probably optional since array_is randomized; this may be redundant $code = ''; foreach (array_rand($seed, 5) as $k) $md5_hash .= $seed[$k]; //We don't need a 32 character long string so we trim it down to 5 $security_code = $code;` – user3288430 Feb 09 '14 at 00:15
So I did not get. I helped you or not? – oleksii.svarychevskyi Feb 09 '14 at 08:13
No :( It is the correct code? i have `Warning: array_rand() [function.array-rand]: Second argument has to be between 1 and the number of elements in the array in C:\AppServ\www\php\total.php on line 7 Warning: Invalid argument supplied for foreach() in C:\AppServ\www\php\total.php on line 7` – user3288430 Feb 09 '14 at 09:17

PHP: How to split a UTF-8 string?

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