fwrite(); doesn't always write

[malikah]

Sometimes this works, sometimes not:

 

$myIP = 'xxx.xxx.xxx.xxx';
if ($_SERVER['REMOTE_ADDR'] == $myIP){
$date = date('g:i l, d M');
$handle = fopen("ip.txt", "a+"); 
fwrite($handle, $myIP."me"); 
fclose($handle);
}

Why only sometimes??