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Language/Type: PHP Queue collections collection mystery

What is the output of the following code? Note: Assume that print_helper($arr) prints a collection in the of a comma-separated array surrounded by [] brackets. A queue prints in [front ... back] order.

$queue = [];
for ($i = 1; $i <= 6; $i++) {
    array_push($queue, $i);

for ($i = 0; $i < count($queue); $i++) {
    print(array_shift($queue) . " ");
print(print_helper($queue) . " size " . count($queue));

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