How can developers improve their understanding of PHP functions through documentation and examples?

Developers can improve their understanding of PHP functions by thoroughly reading the official PHP documentation and studying examples provided. By exploring the documentation, developers can learn about the parameters, return values, and potential use cases of each function. Additionally, experimenting with the functions in a code editor and creating their own examples can help solidify their understanding.

// Example code snippet demonstrating the use of PHP's array_map function
$numbers = [1, 2, 3, 4, 5];

// Define a custom function to double each number in the array
function double($num) {
    return $num * 2;
}

// Use array_map to apply the custom function to each element in the array
$doubled_numbers = array_map("double", $numbers);

print_r($doubled_numbers);