Lpr $varname not working

[ajd335]

Hey all,
I am trying to execute lpr command from PHP script using sell_exec .
If I write like below

$fin = shell_exec( "lpr -Pprinter1 $str");

Its working fine
But in my application user can specify the printer name so , It should store the value of printer name in one variable i.e $pname and then print it like below,

$fin = shell_exec( "lpr -P $pname $str");

But I am not sure whether variable name is working with -Ppname ??
Thanks,

[NogDog]

In the first example you do not have a space between the "-P" flag and the printer name, so perhaps you need to get rid of the space before the $pname variable?