What are the potential pitfalls of converting numbers with varying digits into a specific format in PHP?

When converting numbers with varying digits into a specific format in PHP, potential pitfalls include losing leading zeros, inconsistent formatting, and unexpected results due to different number lengths. To solve this issue, you can use the str_pad function to add leading zeros to the numbers before formatting them.

// Example code to convert numbers with varying digits into a specific format
$numbers = [12, 345, 6789];

foreach ($numbers as $number) {
    $formatted_number = str_pad($number, 4, "0", STR_PAD_LEFT); // Add leading zeros to make the number 4 digits long
    echo $formatted_number . "\n";
}