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php iconv() : Detected an illegal character in input string

 更新時間:2010年12月05日 16:44:19   作者:  
PHP傳給JS字符串用ecsape轉(zhuǎn)換加到url里,又用PHP接收,再用網(wǎng)上找的unscape函數(shù)轉(zhuǎn)換一下,這樣得到的字符串是UTF-8的,但我需要的是GB2312,于是用iconv轉(zhuǎn)換
開始是這樣用的
$str = iconv('UTF-8', 'GB2312', unescape(isset($_GET['str'])? $_GET['str']:''));
上線后報一堆這樣的錯:iconv() : Detected an illegal character in input string

考慮到GB2312字符集比較小,換個大的吧,于是改成GBK:
$str = iconv('UTF-8', 'GBK', unescape(isset($_GET['str'])? $_GET['str']:''));
上線后還是報同樣的錯!

再認(rèn)真讀手冊,發(fā)現(xiàn)有這么一段:
If you append the string //TRANSLIT to out_charset transliteration is activated. This means that when a character can't be represented in the target charset, it can be approximated through one or several similarly looking characters. If you append the string //IGNORE, characters that cannot be represented in the target charset are silently discarded. Otherwise, str is cut from the first illegal character.
于是改成:
$str = iconv('UTF-8', 'GBK//IGNORE', unescape(isset($_GET['str'])? $_GET['str']:''));
本地測試//IGNORE能忽略掉它不認(rèn)識的字接著往下轉(zhuǎn),并且不報錯,而//TRANSLIT是截掉它不認(rèn)識的字及其后面的內(nèi)容,并且報錯。//IGNORE是我需要的。
現(xiàn)在等待上線看結(jié)果(這樣不是好的做法,繼續(xù)琢磨手冊,上網(wǎng)搜搜看),呵呵。。。

在網(wǎng)上找到下面這篇文章,發(fā)現(xiàn)mb_convert_encoding也可以,但效率比iconv差。


轉(zhuǎn)換字符串編碼iconv與mb_convert_encoding的區(qū)別

iconv — Convert string to requested character encoding(PHP 4 >= 4.0.5, PHP 5)
mb_convert_encoding — Convert character encoding(PHP 4 >= 4.0.6, PHP 5)

用法:
string mb_convert_encoding ( string str, string to_encoding [, mixed from_encoding] )
需要先啟用 mbstring 擴展庫,在 php.ini里將; extension=php_mbstring.dll 前面的 ; 去掉

string iconv ( string in_charset, string out_charset, string str )
注意:
第二個參數(shù),除了可以指定要轉(zhuǎn)化到的編碼以外,還可以增加兩個后綴://TRANSLIT 和 //IGNORE,
其中:
//TRANSLIT 會自動將不能直接轉(zhuǎn)化的字符變成一個或多個近似的字符,
//IGNORE 會忽略掉不能轉(zhuǎn)化的字符,而默認(rèn)效果是從第一個非法字符截斷。
Returns the converted string or FALSE on failure.

使用:
1. 發(fā)現(xiàn)iconv在轉(zhuǎn)換字符"-"到gb2312時會出錯,如果沒有ignore參數(shù),所有該字符后面的字符串都無法被保存。不管怎么樣,這個"-"都無法轉(zhuǎn)換成功,無法輸出。另外mb_convert_encoding沒有這個bug.
2. mb_convert_encoding 可以指定多種輸入編碼,它會根據(jù)內(nèi)容自動識別,但是執(zhí)行效率比iconv差太多;如:$str = mb_convert_encoding($str,"euc-jp","ASCII,JIS,EUC-JP,SJIS,UTF- 8");“ASCII,JIS,EUC-JP,SJIS,UTF-8”的順序不同效果也有差異
3. 一般情況下用 iconv,只有當(dāng)遇到無法確定原編碼是何種編碼,或者iconv轉(zhuǎn)化后無法正常顯示時才用mb_convert_encoding 函數(shù)

from_encoding is specified by character code name before conversion. it can be array or string - comma separated enumerated list. If it is not specified, the internal encoding will be used.

$str = mb_convert_encoding($str, "UCS-2LE", "JIS, eucjp-win, sjis-win");
$str = mb_convert_encoding($str, "EUC-JP', "auto");

例子:
$content = iconv("GBK", "UTF-8", $content);
$content = mb_convert_encoding($content, "UTF-8", "GBK");

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