<?php foreach($str as $val){ }
Standard input is empty
array(3) { [0]=> string(4) "chr1" [1]=> string(5) "22222" [2]=> string(6) "333333" } array(3) { [0]=> string(4) "chr1" [1]=> string(5) "22222" [2]=> string(6) "333333" } array(3) { [0]=> string(4) "chr1" [1]=> string(5) "22222" [2]=> string(6) "333333" } array(3) { [0]=> string(4) "chr1" [1]=> string(5) "22222" [2]=> string(5) "33333" }