Generally PHP files created by default is not Utf-8 format, the Web-based solution is as follows:

1. PHP itself is not encoded, and all strings are generally considered binary streams. So only the string you need to enter is Utf-8. If the string has other encodings, you can use the Iconv series function to convert the encoding.

2, note $content = Iconv ("Utf-8", "Gb2312//ignore", $content); IGNORE Ignore error

<?php$f=fopen("test.txt", "wb");$text=utf8_encode("a!"); //先用函数utf8_encode将所需写入的数据变成UTF编码格式。$text="\xEF\xBB\xBF".$text;//"\xEF\xBB\xBF",在没有utf8中文情况下，这串字符不可缺少，生成的文件将成为UTF-8格式，否则依然是ANSI格式。fputs($f, $text);//写入。fclose($f);?>

This creates the file encoding format is really utf-8, but placed in the file of Chinese characters appear garbled phenomenon, after some debugging, the code is as follows:

<?php$ctxtsubmit="好呀";$f=fopen("../".$file, "wb");    //$text=utf8_encode($ctxtsubmit);    //先用函数utf8_encode将所需写入的数据变成UTF编码格式。    $text="\xEF\xBB\xBF".$ctxtsubmit;     //"\xEF\xBB\xBF",在没有utf8中文情况下，这串字符不可缺少，生成的文件将成为UTF-8格式，否则依然是ANSI格式。    fputs($f, $text);    //写入。     fclose($f); ?>

As for "\XEF\XBB\XBF" Why add this string, I do not understand