Creating a directory

[Danny Brow <dan@xxxxxxxxxxxxxxx>]

What's the best way to create a directory with PHP, I tried using:

if (array_exists('dir',$_POST)) {
	$dir_name = test123;  
	shell_exec('mkdir $dir_name'); 

I don't want to have to declare a variable, I would like to do this all
on one line. Like:
        shell_exec('mkdir $_POST['dir']'); // but it don't work
} else {
        print "Get get some coffee!";
}

I'll be putting some error checking in later :)

Thanks,
Dan.

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