You have an array $data = [10, 20, 30]. You want to split it into chunks of size 2 and ensure each chunk has exactly 2 elements by padding with 0 if needed. Which code correctly achieves this?
hard📝 Application Q15 of 15
PHP - Array Functions
You have an array $data = [10, 20, 30]. You want to split it into chunks of size 2 and ensure each chunk has exactly 2 elements by padding with 0 if needed. Which code correctly achieves this?
We want chunks of size 2, each chunk exactly length 2, padding with 0 if chunk is smaller.
Step 2: Analyze each option
$chunks = array_chunk($data, 2);
foreach ($chunks as &$chunk) {
$chunk = array_pad($chunk, 2, 0);
}
print_r($chunks); splits into chunks, then pads each chunk to size 2 with 0, which is correct. $chunks = array_pad(array_chunk($data, 2), 2, 0);
print_r($chunks); tries to pad the array of chunks, which is incorrect. $chunks = array_chunk(array_pad($data, 5, 0), 2);
print_r($chunks); pads the original array to size 5, then chunks, which may add unwanted extra elements. $chunks = array_chunk($data, 2, 0);
print_r($chunks); passes 0 as third argument to array_chunk, which is invalid.
Final Answer:
$chunks = array_chunk($data, 2);
foreach ($chunks as &$chunk) {
$chunk = array_pad($chunk, 2, 0);
}
print_r($chunks); -> Option A
Quick Check:
Pad each chunk after chunking [OK]
Quick Trick:Pad each chunk after chunking, not the whole array [OK]
Common Mistakes:
Padding the whole array before chunking
Passing extra arguments to array_chunk
Trying to pad the array of chunks directly
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