PHP: Decode UTF-8 characters in a string. Really an extended htmlentities.

utf8_decode2.php

<?php

function utf8_decode2($strText)
{
    // Only do the slow convert if there are 8-bit characters
    // avoid using 0xA0 (\240) in preg ranges. RH73 does not like that
    if (! preg_match('/[\200-\237]/', $strText) && ! preg_match('/[\241-\377]/', $strText))
    {
        return $strText;
    }

    // decode three byte unicode characters
    $strText = preg_replace("/([\340-\357])([\200-\277])([\200-\277])/e",
        "'&#'.((ord('\\1')-224)*4096 + (ord('\\2')-128)*64 + (ord('\\3')-128)).';'",
    $strText);

    // decode two byte unicode characters
    $strText = preg_replace("/([\300-\337])([\200-\277])/e",
        "'&#'.((ord('\\1')-192)*64+(ord('\\2')-128)).';'",
    $strText);

    return $strText;
}