What are some best practices for using array_filter() or array_map() in PHP?

When using array_filter() or array_map() in PHP, it is important to ensure that the callback function used is efficient and correctly handles the elements of the array. Additionally, it is recommended to use anonymous functions or predefined functions to keep the code clean and maintainable. Lastly, remember to assign the result of array_filter() or array_map() to a new variable to avoid modifying the original array. 

// Example of using array_filter() to filter out even numbers from an array
$numbers = [1, 2, 3, 4, 5, 6];
$filteredNumbers = array_filter($numbers, function($num) {
    return $num % 2 != 0;
});

print_r($filteredNumbers);

Keywords

array_filter array_map PHP functions arrays

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