mb_convert_encoding()

(PHP 4 >= 4.0.6, PHP 5, PHP 7)

转换字符的编码

说明

将string类型$str的字符编码从可选的$from_encoding转换到$to_encoding。

参数

要编码的string。

$str要转换成的编码类型。

在转换前通过字符代码名称来指定。它可以是一个array也可以是逗号分隔的枚举列表。如果没有提供$from_encoding，则会使用内部（internal）编码。

参见支持的编码。

返回值

编码后的string。

范例

mb_convert_encoding()例子

参见

• mb_detect_order()设置/获取字符编码的检测顺序

For my last project I needed to convert several CSV files from Windows-1250 to UTF-8, and after several days of searching around I found a function that is partially solved my problem, but it still has not transformed all the characters. So I made ​​this:
function w1250_to_utf8($text) {
  // map based on:
  // http://konfiguracja.c0.pl/iso02vscp1250en.html
  // http://konfiguracja.c0.pl/webpl/index_en.html#examp
  // http://www.htmlentities.com/html/entities/
  $map = array(
    chr(0x8A) => chr(0xA9),
    chr(0x8C) => chr(0xA6),
    chr(0x8D) => chr(0xAB),
    chr(0x8E) => chr(0xAE),
    chr(0x8F) => chr(0xAC),
    chr(0x9C) => chr(0xB6),
    chr(0x9D) => chr(0xBB),
    chr(0xA1) => chr(0xB7),
    chr(0xA5) => chr(0xA1),
    chr(0xBC) => chr(0xA5),
    chr(0x9F) => chr(0xBC),
    chr(0xB9) => chr(0xB1),
    chr(0x9A) => chr(0xB9),
    chr(0xBE) => chr(0xB5),
    chr(0x9E) => chr(0xBE),
    chr(0x80) => '€',
    chr(0x82) => '‚',
    chr(0x84) => '„',
    chr(0x85) => '…',
    chr(0x86) => '†',
    chr(0x87) => '‡',
    chr(0x89) => '‰',
    chr(0x8B) => '‹',
    chr(0x91) => '‘',
    chr(0x92) => '’',
    chr(0x93) => '“',
    chr(0x94) => '”',
    chr(0x95) => '•',
    chr(0x96) => '–',
    chr(0x97) => '—',
    chr(0x99) => '™',
    chr(0x9B) => '’',
    chr(0xA6) => '¦',
    chr(0xA9) => '©',
    chr(0xAB) => '«',
    chr(0xAE) => '®',
    chr(0xB1) => '±',
    chr(0xB5) => 'µ',
    chr(0xB6) => '¶',
    chr(0xB7) => '·',
    chr(0xBB) => '»',
  );
  return html_entity_decode(mb_convert_encoding(strtr($text, $map), 'UTF-8', 'ISO-8859-2'), ENT_QUOTES, 'UTF-8');
}

I've been trying to find the charset of a norwegian (with a lot of ø, æ, å) txt file written on a Mac, i've found it in this way:

The line that looks good, gives you the encoding it was written in.
Hope can help someone

aaron, to discard unsupported characters instead of printing a ?, you might as well simply set the configuration directive:
mbstring.substitute_character = "none"
in your php.ini. Be sure to include the quotes around none. Or at run-time with 

Hey guys. For everybody who's looking for a function that is converting an iso-string to utf8 or an utf8-string to iso, here's your solution:
public function encodeToUtf8($string) {
   return mb_convert_encoding($string, "UTF-8", mb_detect_encoding($string, "UTF-8, ISO-8859-1, ISO-8859-15", true));
}
public function encodeToIso($string) {
   return mb_convert_encoding($string, "ISO-8859-1", mb_detect_encoding($string, "UTF-8, ISO-8859-1, ISO-8859-15", true));
}
For me these functions are working fine. Give it a try

many people below talk about using 

to convert non-ascii code into html-readable stuff. Due to my webserver being out of my control, I was unable to set the database character set, and whenever PHP made a copy of my $s variable that it had pulled out of the database, it would convert it to nasty latin1 automatically and not leave it in it's beautiful UTF-8 glory.
So [insert korean characters here] turned into ?????.
I found myself needing to pass by reference (which of course is deprecated/nonexistent in recent versions of PHP)
so instead of

which worked perfectly until I upgraded, so I had to use

Hope it helps someone else out

My solution below was slightly incorrect, so here is the correct version (I posted at the end of a long day, never a good idea!)
Again, this is a quick and dirty solution to stop mb_convert_encoding from filling your string with question marks whenever it encounters an illegal character for the target encoding. 

Hope this helps someone! (Admins should feel free to delete my previous, incorrect, post for clarity)
-A

To add to the Flash conversion comment below, here's how I convert back from what I've stored in a database after converting from Flash HTML text field output, in order to load it back into a Flash HTML text field:
function htmltoflash($htmlstr)
{
 return str_replace("<br />","\n",
  str_replace("",">",
    mb_convert_encoding(html_entity_decode($htmlstr),
    "UTF-8","ISO-8859-1"))));
}

Why did you use the php html encode functions? mbstring has it's own Encoding which is (as far as I tested it) much more usefull:
HTML-ENTITIES
Example:
$text = mb_convert_encoding($text, 'HTML-ENTITIES', "UTF-8");

instead of ini_set(), you can try this
mb_substitute_character("none");

It appears that when dealing with an unknown "from encoding" the function will both throw an E_WARNING and proceed to convert the string from ISO-8859-1 to the "to encoding".

For those wanting to convert from $set to MacRoman, use iconv():

('macintosh' is the IANA name for the MacRoman character set.)

If you are trying to generate a CSV (with extended chars) to be opened at Exel for Mac, the only that worked for me was:

I also tried this:

But the first one didn't show extended chars correctly, and the second one, did't separe fields correctly

Clean a string for use as filename by simply replacing all unwanted characters with underscore (ASCII converts to 7bit). It removes slightly more chars than necessary. Hope its useful. 
$fileName = 'Test:!"$%&/()=ÖÄÜöäü

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