- preg_split: documentation ( source)
<?php
$input = "2011-03-23 10:11:08 34 57 2 25,5 -
2011-03-23 10:11:12 67 54 3 3,5 -
2011-03-23 10:11:16 76 57 3 2,4 -
2011-03-23 10:11:18 39 41 2 25,5 +";
$output = preg_split( "/ (+|-) /", $input );
echo $output;