What best practice should be followed when using arrays in a loop to prevent data retention from previous iterations?

When using arrays in a loop, it is important to reset or clear the array at the beginning of each iteration to prevent data retention from previous iterations. This ensures that each iteration starts with a clean slate and avoids any unintended data carryover.

// Example of resetting the array at the beginning of each iteration in a loop
$array = [1, 2, 3, 4, 5];

foreach ($array as $value) {
    // Reset the array at the beginning of each iteration
    $array = [];
    
    // Perform operations using the array
    // ...
    
    // Add new values to the array for the next iteration
    $array[] = 6;
    $array[] = 7;
}