When working with arrays in PHP, what are some common mistakes to avoid to prevent issues such as excess memory usage or inefficient code execution?

One common mistake when working with arrays in PHP is using functions like array_push() or [] to add elements to an array within a loop. This can lead to excess memory usage and inefficient code execution, especially with large arrays. To avoid this, it's better to create an empty array outside the loop and then populate it inside the loop using direct assignment.

// Incorrect way of adding elements to an array within a loop
$myArray = [];
foreach ($items as $item) {
    array_push($myArray, $item);
}

// Correct way to populate an array within a loop
$myArray = [];
foreach ($items as $item) {
    $myArray[] = $item;
}