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<?php
$week1 = 1;
$week12 = 12;
$week1 = sprintf('%02d', $week1);
$week12 = sprintf('%02d', $week12);
echo "<p>\$week1 = $week1</p>";
echo "<p>\$week12 = $week12</p>";
?>

$week1 = 01

$week12 = 12