PHP Ansi to UTF-8

I'm trying to create a script in PHP for converting some files to UTF-8. I have a file in Greek, where Notepad++开发者_如何学Python indicates that it ahs "ANSI" encoding. When I upload it to the server, it detects it's encoding as UTF-8 (something wrinf i think). Then when I convert it's contents to UTF-8 with utf8_encode () and download the new file, the characters are messed up. I tried to remove the BOM with PHP and the result was the same. I tried to remove the BOM with PHP without converting the file to UTF-8 but the file remained in ANSI encoding, without messed up characters. How can I fix that?

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Remove BOM, then do:

$file = file_get_contents('file.php');
$file = iconv('greek-charset','UTF-8', $file);
file_put_contents('file.php', $file);
//ta-da!

Change greek-charset to correct name of charset (maybe Windows-1253).