adding leading zero to dates in php

I am trying to add a 0 infront of dates 1 through 9 as the dates are listed in the dropdown menu. Here is my code, i thought using d would add leading zeros but doesn't seem to be working. I do not have much php experience so this is a longshot... thank you in advanced! ``` <?PHP FUNCTION DateSelector($inName, $useDate=0) { /* create array so we can name months */ $monthName = ARRAY(1=> "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"); /* if date invalid or not supplied, use current time */ IF($useDate == 0) { $useDate = TIME(); } /* make month selector */ ECHO "<SELECT NAME=" . $inName . "month>\n"; FOR($currentMonth = 1; $currentMonth <= 12; $currentMonth++) { ECHO "<OPTION VALUE=\""; ECHO INTVAL($currentMonth); ECHO "\""; IF(INTVAL(DATE( "m", $useDate))==$currentMonth) { ECHO " SELECTED"; } ECHO ">" . $monthName[$currentMonth] . "\n"; } ECHO "</SELECT>"; /* make day selector */ ECHO "<SELECT NAME=" . $inName . "day>\n"; FOR($currentDay=1; $currentDay <= 31; $currentDay++) { ECHO "<OPTION VALUE=\"$currentDay\""; IF(INTVAL(DATE( "d", $useDate))==$currentDay) { ECHO " SELECTED"; } ECHO ">$currentDay\n"; } ECHO "</SELECT>"; /* make year selector */ ECHO "<SELECT NAME=" . $inName . "year>\n"; $startYear = DATE( "Y", $useDate); FOR($currentYear = $startYear - 0; $currentYear <= $startYear+2;$currentYear++) { ECHO "<OPTION VALUE=\"$currentYear\""; IF(DATE( "Y", $useDate)==$currentYear) { ECHO " SELECTED"; } ECHO ">$currentYear\n"; } ECHO "</SELECT>"; } ?> ```