Detect string encoding in php4

How I can det开发者_如何学Cect string encoding without mb_* and iconv functions in php4

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I don't understand, wouldn't you just use the function:

/* Detect character encoding with current detect_order */
echo mb_detect_encoding($str);

/* "auto" is expanded to "ASCII,JIS,UTF-8,EUC-JP,SJIS" */
echo mb_detect_encoding($str, "auto");

/* Specify encoding_list character encoding by comma separated list */
echo mb_detect_encoding($str, "JIS, eucjp-win, sjis-win");

As described in the PHP.net manual?