php5.4后htmlspecialchars输出为空的问题

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$str = "9enjoy.comµÄphp°æ±¾ÊÇ5.2.10";
echo htmlspecialchars($str);

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5.4.0   The default value for the encoding parameter was changed to UTF-8.

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string htmlspecialchars ( string $string [, int $flags = ENT_COMPAT | ENT_HTML401 [, string $encoding = 'UTF-8' [, bool $double_encode = true ]]] )

Defines encoding used in conversion. If omitted, the default value for this argument is ISO-8859-1 in versions of PHP prior to 5.4.0, and UTF-8 from PHP 5.4.0 onwards.

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1.1 ÆäµÚ¶þ¸ö$flags²ÎÊý£¬Ä¬ÈÏÊÇENT_COMPAT£¬Òò´Ë¸Ä³É
htmlspecialchars($str,ENT_COMPAT,'GB2312');
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Warning: htmlspecialchars(): charset `gbk' not supported, assuming utf-8
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htmlspecialchars($str,ENT_COMPAT,'ISO-8859-1');

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ini_set('default_charset','gbk');
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htmlspecialchars($str,ENT_COMPAT,'');
ÎĵµÖÐÓÐд£ºAn empty string activates detection from script encoding (Zend multibyte), default_charset and current locale (see nl_langinfo() and setlocale()), in this order. Not recommended.
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function htmlout($str) {
return htmlspecialchars($str,ENT_COMPAT,'ISO-8859-1');
}
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ÐÞ¸Äext/standard/html.c
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/* Default is now UTF-8 /
if (charset_hint == NULL)
return cs_utf_8;
°Ñcs_utf_8¸Ä³É cs_8859_1
/ Default is now UTF-8 */
if (charset_hint == NULL)
return cs_8859_1;
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