PHP的feof()方法需要注意的地方

if(file_exists($pmr_config["datasetfile"])){
	$tmp_counter = 0;
	$hd = fopen($pmr_config["datasetfile"], "r");
	if($hd !== FALSE){
		while (!feof($hd)) {
			$buffer = fgets($hd);
                        if($tmp_counter >= $seq){
				$result[] = $buffer;
			}
                $tmp_counter++;

                if($tmp_counter >=$seq + $size){
                    break;
                }
	}
	}else{
		echo "warning:open file {$pmr_config["datasetfile"]} failed!PHP_EOL";
	}
}else{
	echo "warning:file {$pmr_config["datasetfile"]} does not exsits!PHP_EOL";
}
if(file_exists($pmr_config["