29 lines (28 with data), 556 Bytes
#!/usr/bin/php5
<?
#
#
function delarcvols($arcpath) {
$path=$arcpath . ".";
$handle=opendir($path);
while ($file = readdir($handle)) {
if ($file == "." || $file == "..") { } else {
$sln=strlen($file);
$tg=substr($file,0,$sln-4)."_vola1.tar";
$ck=substr($file,$sln-4,4);
if ($ck==".tar") {
system('mv ' . $arcpath . $file . ' ' . $arcpath . $tg);
}
}
}
closedir($handle);
return;
}
?>
<?
#main procedure
#
# get parmfile variables needed
$arcpath="/mnt/archive/";
delarcvols($arcpath);
?>