In PHP, what are some common challenges faced when trying to access and manipulate data from multiple arrays simultaneously?

When trying to access and manipulate data from multiple arrays simultaneously in PHP, a common challenge is keeping track of the array keys and ensuring they align correctly. One solution is to use the `array_keys()` function to get the keys of one array and then iterate over those keys to access the corresponding values in the other arrays. Another approach is to use the `array_combine()` function to combine the keys of one array with the values of another array to create a new associative array.

$array1 = ['a' => 1, 'b' => 2, 'c' => 3];
$array2 = ['a' => 'apple', 'b' => 'banana', 'c' => 'cherry'];

// Using array_keys() to iterate over keys of $array1
$keys = array_keys($array1);
foreach ($keys as $key) {
    echo $array1[$key] . ' - ' . $array2[$key] . PHP_EOL;
}

// Using array_combine() to combine keys and values of $array1 and $array2
$combinedArray = array_combine(array_keys($array1), $array2);
print_r($combinedArray);