What are some potential pitfalls when using PHP functions to manipulate arrays like in the code provided?

One potential pitfall when using PHP functions to manipulate arrays is not checking if the function modifies the original array or returns a new array. This can lead to unexpected results if the original array needs to be preserved. To solve this, always check the documentation of the PHP function being used to understand its behavior.

// Example of using array_map to manipulate an array without modifying the original array

$originalArray = [1, 2, 3, 4, 5];

// Create a new array with modified values without changing the original array
$newArray = array_map(function($value) {
    return $value * 2;
}, $originalArray);

// Output the original array
print_r($originalArray);

// Output the new array
print_r($newArray);