[Solved] What is the output of the following PHP code?$arr = [1, 2, 3, 4, 5]; $result = array_filter($arr, fn($n) => $n % 2 === 0); print_r($result); | PHP

PHP - Array Functions

What is the output of the following PHP code?

$arr = [1, 2, 3, 4, 5];
$result = array_filter($arr, fn($n) => $n % 2 === 0);
print_r($result);

AArray ( [0] => 2 [1] => 4 )

BArray ( [0] => 1 [2] => 3 [4] => 5 )

CArray ( [1] => 2 [3] => 4 )

DArray ( [0] => 2 [2] => 4 )

Step-by-Step Solution

Solution:

Step 1: Understand the callback function
The callback keeps numbers where $n % 2 === 0, meaning even numbers.
Step 2: Identify even numbers and keys
Even numbers in the array are 2 and 4 at keys 1 and 3 respectively.
Final Answer:
Array ( [1] => 2 [3] => 4 ) -> Option C
Quick Check:
Only even numbers kept with original keys [OK]

Quick Trick: Check which elements return true, keys stay same [OK]

Common Mistakes:

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