fopen unicode o UTF

[M0AO]

<?php
$text = "Hello World!";
$f=fopen("test.txt", "wb"); // 'b' flag per forzare il formato binary
$text=utf8_encode($text); 
fputs($f, $text); 
fclose($f); 
?>

Se vuoi aggiungere il BOM (Byte order mark)

<?php
define("BOM", "\\xEF\\xBB\\xBF");

$text = "Hello World!";
$f=fopen("test.txt", "wb"); 
$text=utf8_encode($text); 
// aggiunge il BOM in testa al file 
$text=BOM.$text; 
fputs($f, $text); 
fclose($f); 
?>