collection_mystery0

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Main Page → Exercises → PHP → Solve an Exercise

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));

Output:
1 2 3 4 5 6 [] size 0 1 2 3 [4, 5, 6] size 3 1 2 3 4 5 6 [1, 2, 3, 4, 5, 6] size 6 other

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