[Solved] What will be the output of this PHP code?$arr = ['a' => 0, 'b' => 1, 'c' => false, 'd' => true]; $result = array_filter($arr); print_r($result); | PHP

PHP - Array Functions

What will be the output of this PHP code?

$arr = ['a' => 0, 'b' => 1, 'c' => false, 'd' => true];
$result = array_filter($arr);
print_r($result);

AArray ( [a] => 0 [c] => false )

BArray ( [b] => 1 [d] => true )

CArray ( [b] => 1 [d] => 1 )

DArray ( [a] => 0 [b] => 1 [c] => false [d] => true )

Step-by-Step Solution

Solution:

Step 1: Understand default behavior of array_filter
Without a callback, it removes elements that are falsey (0, false, null, '').
Step 2: Identify which elements remain
Elements with values 1 and true are truthy and remain; keys 'b' and 'd'.
Final Answer:
Array ( [b] => 1 [d] => true ) -> Option B
Quick Check:
Default array_filter removes falsey values [OK]

Quick Trick: Default array_filter removes falsey values [OK]

Common Mistakes:

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