~~~ /** * unicode转utf8 * @param $c */ function unicode_to_utf8($c) { $str = ''; if($c < 0x80) { $str .= $c; } elseif($c < 0x800) { $str .= (0xC0 | $c >> 6); $str .= (0x80 | $c & 0x3F); } elseif($c < 0x10000) { $str .= (0xE0 | $c >> 12); $str .= (0x80 | $c >> 6 & 0x3F); $str .= (0x80 | $c & 0x3F); } elseif($c < 0x200000) { $str .= (0xF0 | $c >> 18); $str .= (0x80 | $c >> 12 & 0x3F); $str .= (0x80 | $c >> 6 & 0x3F); $str .= (0x80 | $c & 0x3F); } return $str; } ~~~