PHP array_filter() not working - php

Question

Goal here is to take text from a log file, plain text delimited by returns with each line delimited by a varying number of spaces.
Getting it into a multi-dimensional is easy enough, getting rid of blank spaces is not. I suppose there are a lot of messy ways to go about this but isn't it one of the reasons for array_filter()?
$alarms = array(
"1530 1545 Place_4 Fault_1",
"1617 1622 Place_1 Fault_2",
"1634 1640 Place_2 Fault_1"
);
foreach ($alarms as $data) {
$subArr = explode(" ", $data);
array_filter($subArr);
print_r($subArr);
echo "<br /><br />";
}
Output:
Array ( [0] => 1530 [1] => [2] => [3] => [4] => [5] => 1545 [6] => [7] => [8] => [9] => [10] => Place_4 [11] => [12] => [13] => [14] => [15] => Fault_1 )
Array ( [0] => 1617 [1] => [2] => [3] => [4] => [5] => 1622 [6] => [7] => [8] => [9] => [10] => Place_1 [11] => [12] => [13] => [14] => [15] => Fault_2 )
Array ( [0] => 1634 [1] => [2] => [3] => [4] => [5] => 1640 [6] => [7] => [8] => [9] => [10] => Place_2 [11] => [12] => [13] => [14] => [15] => Fault_1 )
Want it to be:
Array ( [0] => 1530 [1] => 1545 [2] => Place_4 [3] => Fault_1 )
Array ( [0] => 1617 [1] => 1622 [2] => Place_1 [3] => Fault_2 )
Array ( [0] => 1634 [1] => 1640 [2] => Place_2 [3] => Fault_1 )
Not sure what's wrong...
Cheers.

Answer 1

From the manual, array_filter:
Return values:
Returns the filtered array.
Emphasis on returns. Currently you ignore the return value.

Answer 2

Rather than explode(" ",$something), try this:
$parts = preg_split("/ +/",$something);
This will split on variable numbers of spaces.

Answer 3

updated code
$alarms = array(
"1530 1545 Place_4 Fault_1",
"1617 1622 Place_1 Fault_2",
"1634 1640 Place_2 Fault_1"
);
foreach ($alarms as $data) {
$subArr = explode(" ", $data);
$subArr = array_filter($subArr);
print_r($subArr);
echo "<br /><br />";
}