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Ok, create a file named "test.txt" for testing. I enter following text in this file:

test line 1
test line 2
test line 3

First, we try to use file(). It will generate array.

<?
$file = "test.txt";

$arr = file($file);
var_dump($arr);
// result
// array(3) { [0]=>  string(13) "test line 1 " [1]=>  string(13) "test line 2 " [2]=>  string(11) "test line 3" }
?>

Second, you can use file_get_contents(). It generate string:

<?
$file = "test.txt";

$arr = file_get_contents($file);
var_dump($arr);
// result
// string(37) "test line 1 test line 2 test line 3"
?>

Last, for PHP 4. You can use like this:

<?
$file = "test.txt";

$f = fopen($file, "rb") or die("cannot open file");

$str = fread($f, filesize($file));
echo $str;

fclose($f);
// result
// test line 1 test line 2 test line 3
?>