unescape unicode string and convert utf-8

unescape2utf8.php

<?php

function unicode2utf8($aa){
	###var_dump(func_get_args());
	return mb_convert_encoding( pack("n", hexdec($aa[1]) ), "utf-8", "ucs2" );
}

while( ($f=fgets(STDIN))!==false ){
	$a = str_replace('\\','\',$a ); 
	$a = preg_replace_callback('/\\\u([a-f0-9]{4})/i', "unicode2utf8", $f );
	print $a;
}