Use the string increment operator: 

$newfile = "0001";  # Initialize to 0001
++$newfile;         # Now contains 0002

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Same thing, but longer: 

$newfile = "0001";                       # Initialize to 0001
$newfile = sprintf("%04d", $newfile+1);  # Now contains 0002

[download]

If you just want 2 as opposed to 0002, then it's just: 

$newfile = "0001";  # Initialzie to 0001
$newfile += 1;      # Now contains 2

[download]

In reply to Re: adding 1 to a char of 1 by ikegami
in thread adding 1 to a char of 1 by Anonymous Monk

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