How can I solve the problem of finding an iconv replacement function?

I have found the iconv substitution function online. I don't have a comparison table. I 'd like to find one. I 'd better try it myself. please send me an email address, amani1234 # 21cn.com. thank you, PHPcode/****************************** // GB to UTF-8 encoding * * ***** evaluate the iconv substitution function
I found it online and didn't check the table. I 'd better try it myself. please send me your email address amani1234 # 21cn.com. thank you.

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PHP code

** * ***************************/Function gb2utf8 ($ gbstr) {global $ CODETABLE; if (trim ($ gbstr) = "") return $ gbstr; if (empty ($ CODETABLE )) {$ filename = dirname (_ FILE __). "/gb2312-utf8.table"; $ fp = fopen ($ filename, "r"); while ($ l = fgets ($ fp, 15 )) {$ CODETABLE [hexdec (substr ($ l, 0, 6)] = substr ($ l, 7, 6);} fclose ($ fp );} $ ret = ""; $ utf8 = ""; while ($ gbstr) {If (ord (substr ($ gbstr, 0, 1)> 127) {$ thisW = substr ($ gbstr, 0, 2); $ gbstr = substr ($ gbstr, 2, strlen ($ gbstr); $ utf8 = ""; @ $ utf8 = u2utf8 (hexdec ($ CODETABLE [hexdec (bin2hex ($ thisW )) -0x8080]); if ($ utf8! = "") {For ($ I = 0; $ I <strlen ($ utf8); $ I + = 3) $ ret. = chr (substr ($ utf8, $ I, 3) ;}} else {$ ret. = substr ($ gbstr, 0, 1); $ gbstr = substr ($ gbstr, 1, strlen ($ gbstr) ;}} return $ ret ;} // Unicode to utf8function u2utf8 ($ c) {for ($ I = 0; $ I <count ($ c); $ I ++) $ str = ""; if ($ c <0x80) {$ str. = $ c;} else if ($ c <0x800) {$ str. = (0xC0 | $ c> 6); $ str. = (0x80 | $ c & 0x3F);} else if ($ c <0x10000) {$ str. = (0xE0 | $ c> 12); $ str. = (0x80 | $ c> 6 & 0x3F); $ str. = (0x80 | $ c & 0x3F);} else if ($ c <0x200000) {$ str. = (0xF0 | $ c> 18); $ str. = (0x80 | $ c> 12 & 0x3F); $ str. = (0x80 | $ c> 6 & 0x3F); $ str. = (0x80 | $ c & 0x3F);} return $ str ;}
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Look at this post: http://neture.homeip.net/digiland/viewtopic.php? Pid = 39
Osc_iconv.zip
There is a comparison table

If you need to use iconv, we recommend that you enable iconv in php.
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We recommend that you do not write it yourself.
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We strongly recommend that you use a built-in table. you must not write the table yourself.
Iconv can process many character sets and cannot include all the characters written by itself.