What are common errors that can occur when working with multidimensional arrays in PHP, and how can they be avoided?

One common error when working with multidimensional arrays in PHP is accessing elements incorrectly, which can lead to undefined index or offset notices. To avoid this, always check if the index exists before trying to access it. Another error is not properly iterating through the nested arrays, which can result in missing or incorrect data. Make sure to use nested loops or array functions like `array_walk_recursive` to traverse multidimensional arrays correctly.

// Avoiding undefined index error by checking if index exists before accessing
if(isset($multidimensionalArray[$i][$j])) {
    $value = $multidimensionalArray[$i][$j];
    // Do something with $value
}

// Properly iterating through nested arrays using nested loops
foreach($multidimensionalArray as $innerArray) {
    foreach($innerArray as $value) {
        // Do something with $value
    }
}