Description:
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I work with multibite string such as russian articles in utf-encoding. I use mb_split in my program to split string ro words

function splitString($string)
{
    $tmp=mb_split('[[:space:][:punct:]><]',$string);
    foreach($tmp as $k=>$v)
       if (empty($v)) unset($tmp[$k]);
    return $tmp;
}

In my small test server (1 cpu AMD Sempron(tm) 2800+, php-4.3.10, Suse 9.3, kernel 2.6.11.4-21.9-default) I'm having right results.
But in my producting server (2 cpu Intel(R) Xeon(TM) CPU 3.00GHz with HT, php-5.0.4, RedHat FC4, kernel 2.6.13-1.1526_FC4smp) I'm having strange split, some symbols are converted into '?', some words split in middle of word....
May be problem in 64-bit version of processor