How does Faker::numerify handle leading zeros

By default, `numerify` generates numbers without leading zeros. For example:

php
$faker->numerify(); // Outputs something like '912', '271', etc.

However, you can specify a custom pattern that includes leading zeros by using the `#` character as a placeholder. For instance:

php
$faker->numerify('0####'); // Outputs something like '01234', '09876', etc.

In this example, the `0` character is treated as a literal, while the `#` characters are replaced with random digits, resulting in a string with a leading zero followed by four random digits.

If you need to generate a number with a specific number of digits and ensure a leading zero, you can use the `leading_zero_number` method from the `Faker\Number` class:

php
$faker->numerify('0####'); // Outputs something like '01234', '09876', etc.
$faker->number->leading_zero_number(digits: 10); // Outputs something like '0669336915'

The `leading_zero_number` method generates a string with a leading zero followed by the specified number of digits.

It's important to note that if you use `numerify` with a pattern that includes leading zeros, the generated string will always start with a zero, regardless of the number of `#` characters in the pattern. For example:

php
$faker->numerify('0##'); // Outputs something like '012', '098', etc.

In this case, the generated string will always start with a zero, followed by two random digits.