php number format

A simple question.
I have integer variable $a=2, how can I display it in string format: "SN0002" with 4 '0' inserted? thanks.

Junior Poster in Training

94 posts since Jun 2005

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You may try the follwoing. I used the similar to form my invoice number:[php] $order_num = 'SN'.substr('00000'.$a,-5,5); // e.g. SN00002
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Posting Whiz in Training

294 posts since Jan 2005

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Thanks for the reply.
I also found another way to do that:
$order_num ="SN".str_pad($a,5,0,STR_PAD_LEFT);

Junior Poster in Training

94 posts since Jun 2005

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Another alternative is the sprintf function:

$order_num = "SN".sprintf("%04d", $a);

Junior Poster

172 posts since Jul 2004

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