adding leading zeros to a date

From: "John Smith" <kevin4205@xxxxxxxxxxx>
Date: Wed, 27 Apr 2005 09:57:07 -0700

I get three variables from an HTML form. $InDay, $InMonth, and $InYear.

$InDate = ($inyear . "-" . $inmonth . "-" . $inday);

This gives me a string named $InDate. Its value is:
2005-7-2

I want to have it changed to:
2005-07-02

How do I get php to add leading zeros to this date?

.

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