Online PHP editor | output for cNDsp

<?php $a = array(1, 2, 3, 4, 5); foreach($a as $n) { echo "$n"; if ($n == 4) { echo '.'; $a = array_merge($a, array(6, 7)); } } echo "\n"; $a = array(1, 2, 3, 4, 5); foreach($a as $n) { echo "$n"; if ($n == 4) { echo '.'; $a[] = 6; $a[] = 7; } } echo "\n"; $a = array(1, 2, 3, 4, 5); foreach($a as $n) { echo "$n"; if ($n == 4) { echo '.'; array_push($a, 6); array_push($a, 7); } } echo "\n"; $a = array(1, 2, 3, 4, 5); foreach($a as $n) { echo "$n"; if ($n == 4) { echo '.'; array_push($a, 6, 7); } } echo "\n"; $a = array(1, 2, 3, 4, 5); foreach($a as $n) { echo "$n"; if ($n == 4) { echo '.'; array_push($a, array(6, 7)); } }