[Solved] Which statement about array_walk is TRUE? — Ans: It modifies the original array only if the callback parameter is passed by... | PHP

PHP - Array Functions

Which statement about array_walk is TRUE?

AIt requires the callback function to return the modified value

BIt always returns a new array with modified values

CIt cannot access the keys of the array elements

DIt modifies the original array only if the callback parameter is passed by reference

Step-by-Step Solution

Solution:

Step 1: Understand array_walk behavior
array_walk applies callback to each element; modification requires reference.
Step 2: Evaluate other statements
array_walk does not return a new array, can access keys, and callback return is ignored.
Final Answer:
It modifies the original array only if the callback parameter is passed by reference -> Option D
Quick Check:
Modification needs reference in callback [OK]

Quick Trick: Only reference parameters in callback modify original array [OK]

Common Mistakes:

Master "Array Functions" in PHP

9 interactive learning modes - each teaches the same concept differently

More PHP Quizzes

Which statement about array_walk is TRUE?