PHP preg_replace_callback with unicode

Question

I wrote a simple script below to simulate my problem. Both my string and pattern contain unicode characters.

Basically, if I run it from command line (php -f test.php), it prints "match" as expected. But if I run it through web server (apache, http://localhost/test.php), it prints "no match". I am using PHP 5.3.

Any idea why it behaves differently? How do I make it work through web server?

thanks.

<?php
function myCallback($matches) {
    return $matches[0];
}

$value = 'aaa äää';
$pattern = '/(\bäää)/u';

$value = preg_replace_callback($pattern, 'myCallback', $value, -1, $count);
if ($count > 0) {
    echo "match";
} else {
    echo 'no match';
}
?>

No header. I entered the url to the browser address bar manually. The string is not user input, it's hardcoded in php script. — Formosan
– Formosan, Commented Mar 29, 2012 at 21:42

dlite922 · Accepted Answer · 2012-03-29 21:24:34Z

1

Try changing default_charset using iniset('default_charset','utf-8').

If it works, it means that CLI and Apache PHP configs have separate php.ini configurations and perhaps this variable is set differently, or maybe based on environment.

You can leave that in as a solution or find an alternative.

Cheers,

Dan

answered Mar 29, 2012 at 21:24

dlite922

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1 Comment

Formosan Over a year ago

Adding init_set does not help. I am pretty sure they are using the same php.ini.

ArendE · Accepted Answer · 2012-03-29 21:28:26Z

0

Check your test.php for it to have the correct headers. In PHP you should state:

header('Content-Type: text/html; charset=utf-8');

As in your HTML head:

<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>

As standard it is set to ISO-8895-1 and maybe that is causing the problem. Here you can find some more information about multiple encodings (if utf-8 encoding is not acceptable) and about utf-8 self: http://devlog.info/2008/08/24/php-and-unicode-utf-8/

answered Mar 29, 2012 at 21:28

ArendE

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3 Comments

Formosan Over a year ago

The input string does not come from user, it is hardcoded in php. And I am not displaying any unicode in browser. So I am not sure why it has anything to do with headers. But in my response, yes it does have content-type charaset set to 'utf-8'.

ArendE Over a year ago

I didn't know, maybe try mb_internal_encoding then

ArendE Over a year ago

Also maybe this is helpful: stackoverflow.com/questions/2063192/preg-replace-and-utf8

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