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

My colleague uses iconv for encoding conversion when UTF8 is used, instead of UTF-8, I tested and found UTF8 and UTF-8 in iconv and mb_str results are the same: iconv (& #039; UTF8 & #039;, & #039; GB2312 & #039;, & #039; Test & #039;); and iconv (& #039; UTF-8 & #039;, & #039; GB2312 & #039;, & #039; Test & #039 ;);. But Google... iconvI tested UTF8 AND THE UTF-8 in iconv and mb_str and the results were the same, as shown in: Iconv ('utf8', 'gb2312', 'test ');And Iconv ('utf-8', 'gb2312', 'test ');. But Google also found that the use of UTF8 rather than UTF-8 problems http://readyfighting.com/archives/156.

So what are the differences between the two?

Reply content:

Use by colleaguesiconvI tested UTF8 AND THE UTF-8 in iconv and mb_str and the results were the same, as shown in:Iconv ('utf8', 'gb2312', 'test ');AndIconv ('utf-8', 'gb2312', 'test ');. But Google also found that the use of UTF8 rather than UTF-8 problems http://readyfighting.com/archives/156.

So what are the differences between the two?

According to the libiconv-1.14/lib/encodings. def, The UTF-8 and UTF8 will be recognized as utf8 encoding, so there is no difference, so all the programs that use libiconv are fine, such as php's iconv library.

/* General multi-byte encodings */DEFENCODING(( "UTF-8",                  /* IANA, RFC 2279 */            /*"UTF8",                      JDK 1.1 */            /*"CP65001",                   Windows */            ),               utf8,            { utf8_mbtowc, NULL },        { utf8_wctomb, NULL })#ifdef USE_HPUX_ALIASESDEFALIAS(     "UTF8",                   /* HP-UX */            utf8)#endif

The UTF-8 (as name/mimename) and UTF8 (as alias) can also be identified based on the mbfilter_utf8.c of ext/mbstring, so the same is true.

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 use 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 windows.

Iconv ('utf8', 'gb2312', 'test ');

Get a warning

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

This description should be usedUTF-8This form is correct.

Mbstring. supported-encodings only supports the encoding of mbstring.UTF-8This form.

Maybe you can try to modify php. ini

error_reporting = E_ALL | E_STRICTdisplay_errors = On

You can see the warning information.

Test two lines of code as prompted by felix021.

print_r(mb_list_encodings());print_r(mb_encoding_aliases('UTF8'));

We can see that mb is actually processed as an alias.