Mine

<?php
function avwrite($nick,$chan) {
$filename = 'test.txt';
$somecontent = $nick.$chan." ";
if (is_writable($filename)) {
    if (!$handle = fopen($filename, 'a')) {
         return "Cannot open file ($filename)";
}
else {
    if (fwrite($handle, $somecontent) === FALSE) {
        return "Cannot write to file ($filename)";
}
else {
return "\x0314Success, added\x0307 $nick \x0314to\x0307 $chan"."'s \x0314auto voice";
fclose($handle);
}
}
}
}
?>
<?php
function davwrite($nick,$chan) {
$somecontent1 = $nick.$chan." ";
$filename = 'test.txt';
$contents = file_get_contents('test.txt'); 
$somecontent = str_replace("$somecontent1","",$contents);
if (is_writable($filename)) {
    if (!$handle = fopen($filename, 'w')) {
         return "Cannot open file ($filename)";
}
else {
    if (fwrite($handle, $somecontent) === FALSE) {
        return "Cannot write to file ($filename)";
}
else {
return "\x0314Success, removed\x0307 $nick \x0314to\x0307 $chan"."'s \x0314auto voice";
fclose($handle);
}
}
}
}
?>