What does the PHP function array_filter() do when applied to an array?

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PHP - Array Functions

What does the PHP function array_filter() do when applied to an array?

ACounts the number of elements

BRemoves duplicate values

CSorts the array in descending order

DFilters elements based on a callback function

Step-by-Step Solution

Solution:

Step 1: Recall the purpose of array_filter()
array_filter() keeps elements that pass a test defined by a callback function.
Step 2: Eliminate incorrect options
It does not remove duplicates, sort, or count elements.
Final Answer:
Filters elements based on a callback function -> Option D
Quick Check:
array_filter() = filter with callback [OK]

Quick Trick: Use array_filter() to keep elements matching a condition [OK]

Common Mistakes:

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