How Can I Efficiently Zero-Pad Single-Digit Numbers in a String?

Zero-Padding Digits in a String

In programming, it's often necessary to pad single-digit numbers (1 to 9) with leading zeros (01 to 09) to create a uniform string format.

Concise Padding Method

Thankfully, there's an elegant and concise way to achieve this:

$s = sprintf('%02d', $digit);

Here, $digit represents the single-digit number, and $s is the resulting zero-padded string.

How it Works

The sprintf() function formats a value according to a specified format string. The format string d specifies:

• 0: Zero-pad the value.
• 2: Use a width of 2 characters.
• d: Expect a decimal integer.

Additional Notes

• This method is not suitable for formatting double-precision floating-point numbers, as you initially suggested.
• For more information on sprintf(), please refer to the documentation.

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