PHPfwrite function output text encoding for ANSI, younger brother I need UTF-8

The text output by the PHPfwrite function is encoded as ANSI, and I need to UTF-8 $ xmlContent = 'suppose this string contains a well-formatted XML text message, which contains special characters '; // here using mb_detect_encoding ($ xmlContent); the output result is the UTF-8 // write file $ xmlF PHP fwrite function output the text encoding to ANSI, I need UTF-8

$ XmlContent = 'Suppose this string contains a well-formatted XML text, including special characters ';

// Use mb_detect_encoding ($ xmlContent) here; the output result is a UTF-8

// Write a file
$ XmlFile = fopen ("file. xml", "w ");
Fwrite ($ xmlFile, $ xmlContent );
Fclose ($ xmlFile );


In addition, the referenced global configuration file has such settings header ("Content-Type: text/html; charset = UTF-8 ");

Open the file. xml file in Notepad, save it as, and display ANSI code

I need to save file. xml as a UTF-8, how to change the code?

------ Solution --------------------
Indeed, I have tested your code. I have no problem here ..
Check it carefully. Php file, echo mb_detect_encoding ($ xmlContent); whether it is UTF-8