What are some key differences between PHP array functions that developers should be aware of?

One key difference between PHP array functions is whether they modify the original array or return a new array. Developers should be aware of this distinction when choosing which function to use based on their specific needs. For example, functions like array_map() and array_filter() return a new array without modifying the original, while functions like array_push() and array_pop() directly modify the original array.

// Example of using array_map() to create a new array with modified values
$numbers = [1, 2, 3, 4, 5];
$multipliedNumbers = array_map(function($num) {
    return $num * 2;
}, $numbers);

print_r($multipliedNumbers);