How to Add Leading Zeros to Single-Digit Numbers in PHP?

Prepend Leading 0s to Single-Digit Numbers

In PHP, sometimes it is necessary to ensure that all numbers in an array are displayed as two-digit values, even if some are single digits. To achieve this right padding with zeros is needed.

The following example iterates over an array of numbers and formats those with one digit by prepending a zero to maintain a consistent display:

foreach (range(1, 12) as $month) {
  echo sprintf("%02d", $month);
}

Here's how the code works:

• The range(1, 12) function generates an array of numbers from 1 to 12.

• The sprintf function formats the numbers using the "d" format specifier, which means:

  • The "0" indicates that the number should be zero-padded.
  • The "2" indicates that the number should be padded to a minimum of two digits.

The result of the code is an output where all numbers are displayed as two-digit values, with leading zeros added to single-digit numbers:

01
02
03
04
05
06
07
08
09
10
11
12

This right-padding approach ensures consistency in the display of numeric values, which can be useful in various formatting scenarios.

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