How to Pad Single-Digit Numbers with Leading Zeros in PHP?

How to Left Pad Numbers with Leading Zeros

When iterating over an array of numbers and printing the values, it may be necessary to ensure that all values are displayed as two-digit numbers, regardless of their original length. To address this need, this tutorial will demonstrate how to left pad single-digit numbers with leading zeros.

PHP Solution

To achieve this, the code provided in the question would need to be modified to utilize the sprintf() function. This function allows us to format a string according to a specified format specifier. In this case, the format specifier "d" will format the number as a two-digit string, with any missing digits padded with zeros.

Here is the modified code:

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

By incorporating this formatting, the code will render leading zeros for values between 1 and 9, rendering the desired output:

<option value="01">01</option>
<option value="02">02</option>
<option value="03">03</option>
<option value="04">04</option>
<option value="05">05</option>
<option value="06">06</option>
<option value="07">07</option>
<option value="08">08</option>
<option value="09">09</option>
<option value="10">10</option>
<option value="11">11</option>
<option value="12">12</option>

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