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$t = "1.aa 2.bb 3.cc 4.dd 5.ee 6.ff 7.gg 8.hh 9.ii 10.jj 11.kk";
echo preg_replace('/\s+/', '<br>', $t);
$t="1.aa 2.bb 3.cc 4.dd 5.ee 6.ff 7.gg 8.hh 9.ii 10.jj 11.kk";
$a=explode(' ',$t);
$b=array_filter($a);
print_r($b);
Array
(
[0] => 1.aa
[2] => 2.bb
[4] => 3.cc
[6] => 4.dd
[8] => 5.ee
[9] => 6.ff
[11] => 7.gg
[13] => 8.hh
[15] => 9.ii
[17] => 10.jj
[19] => 11.kk
)
print_r(preg_split('/\s+/', $t));
$t="1.aa 2.bb 3.cc 4.dd 5.ee 6.ff 7.gg 8.hh 9.ii 10.jj 11.kk";
$new=preg_replace('/(\d+\.[^0-9]+)/',"$1<br>",$t);
echo $new;
/*
1.aa
2.bb
3.cc
4.dd
5.ee
6.ff
7.gg
8.hh
9.ii
10.jj
11.kk
*/