How do I convert arabic letters in htmlentities symbols?

I need convert arabic letters in htmlentities symbols. Codepage: ISO-8859-1.

سك - this is arabic symbol for example.

htmlentities("سك")

returns:

س� 

How can I 开发者_如何学编程get from this symbol the html-entities سك?

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htmlentities() can do only characters that have named entities. See this question on how to convert arbitrary characters into numeric entities.

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You're probably not targeting the correct charset. Try: htmlentities('سك', ENT_QUOTES, 'UTF-8');

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i'm using a function to make sure there are no html code or cotation posted by user

function cleartext($x1){

    $x1 = str_replace('"','',$x1);
    $x1 = str_replace("'",'',$x1);
    $x1 = htmlentities($x1, ENT_QUOTES, 'UTF-8');
    return $x1;
}

so thank for ( ENT_QUOTES, 'UTF-8' ) it helped me to find what am looking for