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Re: Taking parameters into functions [message #175660 is a reply to message #175657]

Sun, 16 October 2011 16:57

Peter H. Coffin
Messages: 245
Registered: September 2010

Karma:

Senior Member

On Sun, 16 Oct 2011 14:56:56 +0200, houghi wrote:
> I have the following code:
>
> $File = "test.txt";
> function write_fifo($data,$File) {
> echo $data."<br>".$File."<hr>";
> $fh = fopen($File, 'w') or exit("can't open file -".$File."= .");
> fwrite($fh, $data);
> fclose($fh);
> }
> write_fifo("Something Here",$File);
>
> This works. What I want to ask is about the write_fifo() part. Is it
> possible to have something like the following:
> write_fifo("Something Here");
> instead of the line including $File.
>
> Not a real must. Just a nice to have. It would make my code perhaps a
> bit cleaner AND I would have learned something that I could use in the
> future.
>
> I have looked, but could not find anything. Probably because I have no
> idea what I should be looking for (php novice and all that)

In addition to Jerry's method (which I agree is a bad idea, for the
reasons he gives), you can also default $File in the function
declaration and make the parameter optional

function write_fifo($data,$File = "test.txt") {
echo $data."<br>".$File."<hr>";
$fh = fopen($File, 'w') or exit("can't open file -".$File."= .");
fwrite($fh, $data);
fclose($fh);
}

You can even acheive a level of portability by defaulting the setting of
the parameter to a constant, like

define ("fifoFile", "/path/to/default/fifo/file");
....
function write_fifo($data,$File = fifoFile) {
echo $data."<br>".$File."<hr>";
$fh = fopen($File, 'w') or exit("can't open file -".$File."= .");
fwrite($fh, $data);
fclose($fh);
}

--
2. My ventilation ducts will be too small to crawl through.
--Peter Anspach's list of things to do as an Evil Overlord

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[Message index]

		Taking parameters into functions By: houghi on Sun, 16 October 2011 12:56
		Re: Taking parameters into functions By: Jerry Stuckle on Sun, 16 October 2011 13:27
		Re: Taking parameters into functions By: houghi on Sun, 16 October 2011 14:16
		Re: Taking parameters into functions By: Jerry Stuckle on Sun, 16 October 2011 18:32
		Re: Taking parameters into functions By: Peter H. Coffin on Sun, 16 October 2011 16:57
		Re: Taking parameters into functions By: houghi on Sun, 16 October 2011 18:15
		Re: Taking parameters into functions By: alvaro.NOSPAMTHANX on Mon, 17 October 2011 08:10

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