[Solved] Identify the error in this PHP code using array_filter:$data = [10, 15, 20]; $result = array_filter($data, function($x) { if ($x > 15) return true; }); print_r($result); | PHP

PHP - Array Functions

Identify the error in this PHP code using array_filter:

$data = [10, 15, 20];
$result = array_filter($data, function($x) {
  if ($x > 15) return true;
});
print_r($result);

AThe callback function does not return false for some values.

Barray_filter requires a third argument for keys.

CThe array must be associative for array_filter to work.

DThe print_r function cannot print arrays.

Step-by-Step Solution

Solution:

Step 1: Check callback return values
The callback returns true only if $x > 15, but returns nothing (null) otherwise.
Step 2: Understand array_filter behavior
Callback must return true or false explicitly; null is treated as false but is unclear and risky.
Final Answer:
The callback function does not return false for some values. -> Option A
Quick Check:
Callback must return true or false explicitly [OK]

Quick Trick: Always return true or false in callback [OK]

Common Mistakes:

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