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

PHP fwrite function output text encoding for ANSI, I need UTF-8

$xmlContent = ' Assume that the string is a well-formed XML text message, which includes a special character ';

Use Mb_detect_encoding ($xmlContent) here; The result of the output is UTF-8

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


Another, the referenced global configuration file has this set header ("content-type:text/html; Charset=utf-8 ");

Open the File.xml file with Notepad, save as, display ANSI encoding

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

------Solution--------------------
Indeed, I have tested your code. I have no problem here.
You check it carefully. PHP file, echo mb_detect_encoding ($xmlContent); utf-8

