Can UTF8 and UTF-8 be mixed in iconv-php?

Colleagues use iconvWhen encoding conversion is used when UTF8, instead of UTF-8, I tested the next found UTF8 and UTF-8 in Iconv and MB_STR results are the same, such as: iconv('UTF8', 'GB2312', '测试');And iconv('UTF-8', 'GB2312', '测试');。 But Google also found that some people because of the use of UTF8 rather than UTF-8 encounter problems http://readyfighting.com/archives/156.

So what's the difference between using them?

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When a colleague uses iconv the encoding conversion when using the UTF8 instead of the UTF-8, I tested the next found UTF8 and UTF-8 in Iconv and MB_STR results are the same, such as: iconv('UTF8', 'GB2312', '测试'); and iconv('UTF-8', 'GB2312', '测试'); . But Google also found that some people because of the use of UTF8 rather than UTF-8 encounter problems http://readyfighting.com/archives/156.

So what's the difference between using them?

According to Libiconv-1.14/lib/encodings.def, UTF-8 and UTF8 will be identified as UTF8 encoding, so there is no difference, so all programs that use Libiconv are fine, such as the PHP iconv library.

/* General Multi-Byte Encodings */defencoding (("UTF-8",/                  * IANA, RFC 2279 */            * "UTF8",                      JDK 1.1 */            * "CP6 5001 ",                   Windows */            ),               utf8,            {UTF8_MBTOWC, null},        {utf8_wctomb, null}) #ifdef USE_HPUX_ Aliasesdefalias (     "UTF8",/                   * HP-UX */            UTF8) #endif

According to Ext/mbstring's mbfilter_utf8.c, UTF-8 (as Name/mimename) and UTF8 (as Alias) can also be identified, so is the same.

static const char *mbfl_encoding_utf8_aliases[] = {"UTF8", null};const mbfl_encoding Mbfl_encoding_utf8 = {     Mbfl_no _encoding_utf8,    "UTF-8",    "UTF-8",    (const char * (*) []) &mbfl_encoding_utf8_aliases,    Mblen_ Table_utf8,    Mbfl_enctype_mbcs};

By the way, MySQL does not recognize utf-8 and must be UTF8.

mysql> CREATE TABLE t1 (ID int primary key, name int) character Set utf-8;
ERROR 1115 (42000): Unknown character set: ' UTF '

Hello, I tested a line of code in the Windows environment

Iconv (' UTF8 ', ' GB2312 ', ' test ');

Get a warning

Notice:iconv (): Wrong charset, conversion from ' UTF8 ' to ' GB2312 ' are not allowed

This means that the form of UTF-8 should be used correctly.

Mbstring.supported-encodings mentioned in the mbstring supported encoding is also only UTF-8 this form.

Maybe you can try to modify the php.ini.

error_reporting = E_all | E_strictdisplay_errors = On

Maybe you can see the warning message.

Test two lines of code according to FELIX021 's tips

Print_r (Mb_list_encodings ());p Rint_r (mb_encoding_aliases (' UTF8 '));

It is true that MB is treated as an alias.

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