What potential pitfalls or issues could arise when manipulating multidimensional arrays in PHP?

One potential issue when manipulating multidimensional arrays in PHP is accidentally overwriting or losing data due to incorrect array manipulation. To avoid this, always double-check array keys and values before making changes. Additionally, be cautious when using nested loops to iterate through multidimensional arrays to prevent unintended modifications. 

// Example of safely manipulating a multidimensional array
$multiArray = [
    'first' => ['a', 'b', 'c'],
    'second' => ['x', 'y', 'z']
];

// Adding a new element to the 'first' subarray
if (isset($multiArray['first'])) {
    $multiArray['first'][] = 'd';
}

print_r($multiArray);

Keywords

nested arrays array functions memory usage array keys array values

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