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Which PHP function is used to extract all the keys from an array?

easy📝 Conceptual Q11 of 15
PHP - Array Functions
Which PHP function is used to extract all the keys from an array?
Aarray_map()
Barray_values()
Carray_keys()
Darray_filter()
Step-by-Step Solution
Solution:

  1. Step 1: Understand the function purpose

    array_keys() returns all keys from an array.

  2. Step 2: Compare with other functions

    array_values() returns values, not keys; others do different tasks.

  3. Final Answer:

    array_keys() -> Option C

  4. Quick Check:

    Keys extraction = array_keys() [OK]
Quick Trick: Keys come from array_keys(), values from array_values() [OK]
Common Mistakes:
  • Confusing array_keys() with array_values()
  • Using array_map() to get keys
  • Trying to get keys with array_filter()

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