What are the potential pitfalls of using array_shift in a loop when manipulating arrays in PHP?

Using array_shift in a loop to manipulate arrays in PHP can lead to unexpected behavior because it modifies the original array and shifts all keys. This can result in incorrect iteration and potential data loss. To avoid this issue, it's recommended to create a copy of the original array and manipulate the copy instead.

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

foreach($copyArray as $value) {
    // Manipulate $copyArray instead of $originalArray
    array_shift($copyArray);
}

// $originalArray remains unchanged
print_r($originalArray);