Given the array $data = ['apple' => 3, 'banana' => 0, 'cherry' => 5, 'date' => 0];, which PHP code correctly extracts only the keys with non-zero values?

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PHP - Array Functions

Given the array $data = ['apple' => 3, 'banana' => 0, 'cherry' => 5, 'date' => 0];, which PHP code correctly extracts only the keys with non-zero values?

A$keys = array_keys($data);

B$keys = array_keys(array_filter($data));

C$keys = array_values(array_filter($data));

D$keys = array_filter(array_keys($data));

Step-by-Step Solution

Solution:

Step 1: Filter array to keep non-zero values
array_filter($data) removes entries with zero values.
Step 2: Extract keys from filtered array
array_keys() gets keys from the filtered array, giving only keys with non-zero values.
Final Answer:
$keys = array_keys(array_filter($data)); -> Option B
Quick Check:
Filter then keys = array_keys(array_filter()) [OK]

Quick Trick: Filter first, then get keys with array_keys(array_filter()) [OK]

Common Mistakes:

Using array_values() instead of array_keys() after filtering
Not filtering before extracting keys
Filtering keys instead of values

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Given the array $data = ['apple' => 3, 'banana' => 0, 'cherry' => 5, 'date' => 0];, which PHP code correctly extracts only the keys with non-zero values?

Step 1: Filter array to keep non-zero values

Step 2: Extract keys from filtered array

Final Answer:

Quick Check:

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