grid.php
<?php
$a=0;
while($c=fgets(STDIN)) {
	$x[$a]=explode(" ",$c);
	$z[]=array_sum($x[$a++]);
}
print_r($x);

grid.txt
01 34 46 31 55 21 16 88 87 87
32 40 82 40 43 96 08 82 41 86
30 16 24 18 04 54 65 96 38 48
32 00 99 90 24 75 89 41 04 01
11 80 31 83 08 93 37 96 27 64
09 81 28 41 48 23 68 55 86 72
64 61 14 55 33 39 40 18 57 59
49 34 50 81 85 12 22 54 80 76
18 45 50 26 81 95 25 14 46 75
22 52 37 50 37 40 16 71 52 17

When run with "php grid.php | grid.txt", this gives:

Array
(
    [0] => Array
        (
            [0] => 01
            [1] => 34
            [2] => 46
            [3] => 31
            [4] => 55
            [5] => 21
            [6] => 16
            [7] => 88
            [8] => 87
            [9] => 87


        )

    [1] => Array
        (
            [0] => 32
            [1] => 40
            [2] => 82
            [3] => 40
            [4] => 43
            [5] => 96
            [6] => 08
            [7] => 82
            [8] => 41
            [9] => 86


        )

    [2] => Array
        (
            [0] => 30
            [1] => 16
            [2] => 24
            [3] => 18
            [4] => 04
            [5] => 54
            [6] => 65
            [7] => 96
            [8] => 38
            [9] => 48


        )

    [3] => Array
        (
            [0] => 32
            [1] => 00
            [2] => 99
            [3] => 90
            [4] => 24
            [5] => 75
            [6] => 89
            [7] => 41
            [8] => 04
            [9] => 01


        )

    [4] => Array
        (
            [0] => 11
            [1] => 80
            [2] => 31
            [3] => 83
            [4] => 08
            [5] => 93
            [6] => 37
            [7] => 96
            [8] => 27
            [9] => 64


        )

    [5] => Array
        (
            [0] => 09
            [1] => 81
            [2] => 28
            [3] => 41
            [4] => 48
            [5] => 23
            [6] => 68
            [7] => 55
            [8] => 86
            [9] => 72


        )

    [6] => Array
        (
            [0] => 64
            [1] => 61
            [2] => 14
            [3] => 55
            [4] => 33
            [5] => 39
            [6] => 40
            [7] => 18
            [8] => 57
            [9] => 59


        )

    [7] => Array
        (
            [0] => 49
            [1] => 34
            [2] => 50
            [3] => 81
            [4] => 85
            [5] => 12
            [6] => 22
            [7] => 54
            [8] => 80
            [9] => 76


        )

    [8] => Array
        (
            [0] => 18
            [1] => 45
            [2] => 50
            [3] => 26
            [4] => 81
            [5] => 95
            [6] => 25
            [7] => 14
            [8] => 46
            [9] => 75


        )

    [9] => Array
        (
            [0] => 22
            [1] => 52
            [2] => 37
            [3] => 50
            [4] => 37
            [5] => 40
            [6] => 16
            [7] => 71
            [8] => 52
            [9] => 17
        )

)