Are there any built-in PHP functions or constants that provide localized month names for different languages, or is creating a custom array the most common approach?

To localize month names in PHP, you can use the `strftime` function with the `%B` format specifier, which will return the full month name based on the current locale set using `setlocale`. However, if you need more control over the month names or want to support multiple languages, creating a custom array mapping month numbers to names in different languages is a common approach.

// Set the desired locale for month names
setlocale(LC_TIME, 'fr_FR.utf8');

// Get the localized month name for a specific month number
$monthNumber = 1; // January
$localizedMonthName = strftime('%B', mktime(0, 0, 0, $monthNumber, 1, date('Y')));

echo $localizedMonthName; // Output: "janvier"