php读资料的4中方法

$fp = fopen("download.php","rb");
	while(!feof($fp)){
		echo "fopen: ".fgets($fp);
	}
	fclose($fp);

$lines = file("download.php");
	foreach($lines as $line){
		echo "file: ".$line;
	}

$content = file_get_contents("download.php");
echo "get_contents: ".$content;

echo "readfile: ";
	readfile("download.php");
	flush();