How Can I Left-Pad Single-Digit Numbers with Leading Zeros in PHP?

Leading Zeros for Single-Digit Numeric Strings

Question:

When working with a loop of single-digit and double-digit numbers, you encounter the need to ensure that all values are displayed as two-digit numbers. The goal is to prepend zeros to single-digit numbers, preserving double-digit numbers, resulting in values left-padded with zeros to a minimum of two digits.

Solution:

For PHP, the sprintf() function provides an effective solution. Using the format string "d", where '02' specifies the minimum width of the string and 'd' denotes an integer, we can achieve the desired output:

foreach (range(1, 12) as $month): 
  $paddedMonth = sprintf("%02d", $month);
  echo "<option value=\"$paddedMonth\">$paddedMonth</option>"; 
endforeach;

This code will output:

<option value="01">01</option>
<option value="02">02</option>
...
<option value="12">12</option>

Note:

Consider saving the result of sprintf() to a variable to avoid repeated function calls for improved efficiency.

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