I now recall that ColdFusion's location tag accepts no data parameters, so
you can't pass data to it. It is essentially a redirect. Thus, it may be
doing an HTTP header location under the hood.
In ColdFusion, I may have logic like so:
-------------------------
<cfset num=0>
<!-- whitespace -->
<cfif (num = 1)>
OK!
<cfelse>
<location url="gohere.cfm">
</cfif>
I don't get any errors, so I think it buffers the entire output first and
then throws away if it determines if it needs to go elsewhere.
In PHP, it would look something like this:
----------------------------------------
<?php
num = 0;
?>
<!-- whitespace -->
<?php
if (num = 1) {
header("location: gohere.php");
}
?>
This will not run, because of the whitespace. I presume PHP immediately
begins the http/html stream as soon as it sees non-php code.
In ColdFusion, it doesn't care about the whitespace.
In PHP, it does care about the whitespace.
That is what I discovered in my original problem. I had a whitespace
between the php identifiers. I simply closed off the whitespace, and I was
fine.
Thanks for clarifying all this.
Sincerely,
Stephen
----- Original Message -----
From: "Rasmus Lerdorf" <[EMAIL PROTECTED]>
To: "webapprentice" <[EMAIL PROTECTED]>
Cc: "James" <[EMAIL PROTECTED]>; "Jason Murray"
<[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
Sent: Wednesday, March 27, 2002 12:24 AM
Subject: Re: [PHP] Any PHP equivalent of Macromedia ColdFusion's location
tag?
> > Hi Mr. Lerdorf,
> > I look forward to you upcoming O'Reilly PHP book. =)
> >
> > Yes, a META tag refresh or Javascript control seems to be the only way
left.
> > Strange that URL redirection is so unusual to implement in PHP compared
to
> > ASP or Coldfusion (unless they do something klunky under the hood).
>
> They do. There is no magic here. If you want output on a page and also do
> a redirect, the only way to do it is with a javascript meta-refresh (well,
> you can do some tricks with frames as well, but I lump those tricks under
> Javascript redirects). I don't care what ASP of Cold Fusion tells you, if
> they allow you to send some data for the page and then redirect, then they
> are either doing a Javascript meta-refresh or simply tossing your data and
> doing a Location redirect.
>
> If you have no output, then you can use a Location redirect. What ASP and
> Cond Fusion might do is buffer your output and simply throw it away if you
> then at some point do a Location redirect. That seems kind of silly to me
> though. It seems like a mistake to me to just chuck away output data like
> that. You can do that with PHP as well by turning on output buffering.
> You can send all sorts of output after a Location redirect, but there will
> be no browser around to see it because it has already received the
> Location redirect and is off viewing the other page.
>
> > Anyway, I also noticed that when the manual says you cannot output
ANYTHING,
> > I found out that if I close out all my spaces in the PHP page by
tightening
> > the php container tags, I will not output anything first. I forgot that
> > even whitespace would be considered a web page and would generate http
> > headers (since the PHP processor probably translates whitespace as
> > echo/print statements).
>
> Yup, a space is as valid a character as any other.
>
> -Rasmus
>
> PS. One of the things with PHP is that we have never gone out of our way
> to hide the actual mechanics of HTTP very much from the users. I think it
> is important for people to actually understand what is going on. That's
> why we don't have a redirect() function but instead tell you to send an
> HTTP header called Location. Because that is what needs to happen under
> the covers.
>
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