[Solved] Which of the following best describes the callback function used in array_reduce? — Ans: A function that takes two parameters: carry and item, and returns the updated... | PHP

PHP - Array Functions

Which of the following best describes the callback function used in array_reduce?

AA function that takes one parameter and returns a boolean

BA function that takes two parameters: carry and item, and returns the updated carry

CA function that sorts the array elements

DA function that merges two arrays

Step-by-Step Solution

Solution:

Step 1: Identify callback parameters in array_reduce
The callback receives the carry (accumulated value) and the current item.
Step 2: Understand callback's return value
The callback returns the updated carry for the next iteration.
Final Answer:
A function that takes two parameters: carry and item, and returns the updated carry -> Option B
Quick Check:
Callback signature = (carry, item) => carry [OK]

Quick Trick: Callback must return updated carry value [OK]

Common Mistakes:

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Which of the following best describes the callback function used in array_reduce?