PHP 5 Multi Array - Not Creating Sub Arrays Correctly

I am using PH5 and am reading a file into an array that is delimited by a "space" between each piece of information, it has 5 pieces of information, however, I only need 4 of those so I simply do not add Data1 to the array at all.

I am lost here as to what I am doing wrong, I have tried several ways of doing this and it seems to fail everytime. A couple of ways I had tried it worked fine for the first line in the file, but then did not do the same for the rest of them but only created a new main key for the Data0 but not the subdata for it.

Example file layout

Line1: Data0 Data1 Data2 Data3 Data4
Line2: Data0 Data1 Data2 Data3 Data4
Line3: Data0 Data1 Data2 Data3 Data4
Line4: Data0 Data1 Data2 Data3 Data4
Line5: Data0 Data1 Data2 Data3 Data4
Line6: Data0 Data1 Data2 Data3 Data4

etc...

All of them with exception to Data4 will not have spaces. Data4 won't always have a space, but it is possible, so using PHP5 I have told it to only allow a max of 5 sets of data once it reaches the 5th it will no longer chunk off new pieces and the Data4 will be whatever was left for the 5th piece.

Example of how I am trying to get the data to form up in the array:

Array
(
    [0] => Data0
      Array
      (
            [0] => Data4
            [1] => Data2
            [2] => Data3
      )

    [1] => Data0
      Array
      (
            [0] => Data4
            [1] => Data2
            [2] => Data3
      )
);

I was hoping to be able to call the array values or echo one out like echo $mydata[1][2];

Anyhow, if anyone can help me fix this and help me understand what im doing wrong so I can better understand arrays a bit. I have been all over some tutorials as well as the php.net site, but the one thing they are not explaining is exactly how to use them and create them, I seem to find nothing but examples of what one would look like using X type of array. I need more of the mechanics of it and less of the body.

I have attached a sample of the code exactly how I have been trying to use it though I had previously changed it around trying to form the aray different ways but failed so far.

I am using WAMP to test this locally on a Windows XP Pro install in VMWare. Not sure if that matters, but I tried to set it up as close to my hosts webserver settngs including extensions etc.. (Other than mine is XP and the host is linux) Just to be sure anything I make would most likely work on the real location it is meant to be placed.

Apache 2.2.8 and PHP 5.2.6Start Free Trial

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$file = 'data.dat';
$mydata = array();
$index = 0;
 
while (!feof($file)) {
	$line = fgets($file);
	// Max of 5 incase Data4 has any spaces it does not get seperated.
	$line = explode(' ', $line, 5);
	$mydata[] = $line[0];
	$mydata[$index][] = $line[4];
	$mydata[$index][] = $line[2];
	$mydata[$index][] = $line[3];
	$index++;
}
 
print_r($mydata);