What are some potential pitfalls of converting a two-dimensional array into a one-dimensional array in PHP?

One potential pitfall of converting a two-dimensional array into a one-dimensional array in PHP is losing the structure and organization of the data. To solve this issue, you can use the `array_merge` function to merge all sub-arrays into a single array while keeping track of the keys.

// Sample two-dimensional array
$twoDimArray = [
    [1, 2, 3],
    [4, 5, 6],
    [7, 8, 9]
];

// Convert two-dimensional array into one-dimensional array
$oneDimArray = [];
foreach ($twoDimArray as $subArray) {
    $oneDimArray = array_merge($oneDimArray, $subArray);
}

print_r($oneDimArray);