What are some common challenges when sorting data alphabetically in PHP?

One common challenge when sorting data alphabetically in PHP is ensuring that the sorting is case-insensitive. By default, PHP's sorting functions are case-sensitive, which can lead to unexpected results. To solve this, you can use the `strcasecmp()` function within a custom sorting function to compare strings in a case-insensitive manner.

// Sample array of data to be sorted alphabetically
$data = array("Apple", "banana", "cherry", "Date");

// Custom sorting function using strcasecmp for case-insensitive sorting
usort($data, function($a, $b) {
    return strcasecmp($a, $b);
});

// Output the sorted data
print_r($data);