Programmatically Post Extended Ascii Character To Facebook Post?

I'm trying to post special characters to facebook feed, but the characters shown in the facebook post doesn't show as I intended.

/This code works as I intended, showing on facebook post
$facebook->api('/me/feed', 'POST', array('message' => $tmp));

//I expect the displayed text in facebook post will be 'вн' but it shows strange characters instead
$facebook->api('/me/feed', 'POST', array('message' => substr($tmp, 1, 2)));

how to tackle this problem?



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I tried :

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'caption' => "www.google.it"
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Inputs:
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And I used as below code using php concatenate the HTML string

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PHP Code:

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[Code]....

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