Re: [PHP] how to display GD graphic in web page
Thanks for the detailed explanation.
I should have expanded further on my design goals though. I initiated my
examination of this problem when I tried to generate my "on-the-fly" images
with a class method like:
// on_the_fly.php
class on_the_fly {
function on_the_fly() {
}
function a_graphic() {
$image = imagecreatefrompng("my_graphic.png");
imagepng($image);
}
}
then call the method as needed as in:
// my_page.php
Untitled Document
include ('on_the_fly.php');
$otf_graphic = new on_the_fly();
echo "
a_graphic()">;
This resulted in a page filled with random characters.
So I interpret from your response that I'm still unable to reference "a_graphic()"> and MUST create my on-the-fly graphic in a
*.php file or *.png as you suggest.
Thanks
Chris
""Richard Lynch"" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
> On Mon, October 24, 2005 7:14 pm, Chris wrote:
>> I don't understand what is going on with a simple example I created to
>> understand how GD graphics are presented in a web page.
>
> Basically, you were right the first time.
>
> Think of it this way:
>
> HTML pages generally have, well, HTML in them.
>
> Sometimes that HTML has an IMG tag, and that provides a URL to an image.
>
> But, with static images, you don't copy/paste the image itself right
> into your HTML.
>
> It's just another URL that the browser gets after it gets the HTML.
>
> PHP doesn't change any of this, really, except that now the URL for
> the image just *happens* to be an image that is composed on the fly.
>
>> Now if I treat graphic.php as an image, and reference in another page
>
> graphic.php *is* an image, just like, any other image.
>
> So you should treat it like an image.
>
>> my_graphic.png is no longer displayed and the web page gets filled
>> with
>> random characters.
>
> If you had a PNG, and if you opened up that file in Notepad/BBEdit/vi
> and you copied all the stuff out of it and pasted it into your HTML,
> that's pretty much what you would get, right?
>
> Just like you just did with PHP doing the "paste"
>
> Now, one little caveat:
>
> Microsoft, in its infinite wisdom, frequently IGNORES the
> "Content-type:" head from the HTTP specification in various versions
> of Internet Explorer.
>
> Instead, MS IE will examine the URL and see: graphic.php and say, "Oh,
> never mind that silly HTTP specification and Content-type, *this* must
> be a .php file because it ends in .php, and everybody uses 8.3,
> right?"
>
> Then, of course, MS IE says, "Oh my goodness! I don't know how to
> handle a '.php' file! Woe is me!" and then pops up a Window telling
> the user it has encountered a file of type .php and doesn't know what
> to do with it.
> [I'll tell 'em what to do with it... :-)]
>
> Anyway, if you're going to do much with dynamic images, you might as
> well start getting them to have ".png" filenames now.
>
> There are lots of techniques for this, but the whole ignoring
> Content-type mess of MS IE, and because of their similar idiocy with
> GET parameters for .pdf and .swf files, I recommend this:
>
> Make your HTML and your URL indistinguishable from static HTML/URL, so
> that MS IE can't *possibly* [bleep] up.
>
> Put this in an .htaccess file next to the graphic.php script:
>
>
> ForceType application/x-httpd-php
>
>
> Now, rename graphic.php to graphic.png
>
> Voila.
>
> MS IE "sees" graphic.png and "knows" it's a PNG.
>
> Apache was told that graphic.png is *really* a PHP script, so Apache
> fires up PHP and PHP/GD make the image and spit it out.
>
> Your HTML and PNG are indistinguishable by the browser from a static
> image, and they'd have to break every PNG out there to make yours not
> work. Which, knowing MS, is not *impossible* but it's a lot less
> likely than their various versions of IE that will break on
> http://example.com/graphic.php as a PNG image URL.
>
> --
> Like Music?
> http://l-i-e.com/artists.htm
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Re: [PHP] how to display GD graphic in web page
On Mon, October 24, 2005 7:14 pm, Chris wrote: > I don't understand what is going on with a simple example I created to > understand how GD graphics are presented in a web page. Basically, you were right the first time. Think of it this way: HTML pages generally have, well, HTML in them. Sometimes that HTML has an IMG tag, and that provides a URL to an image. But, with static images, you don't copy/paste the image itself right into your HTML. It's just another URL that the browser gets after it gets the HTML. PHP doesn't change any of this, really, except that now the URL for the image just *happens* to be an image that is composed on the fly. > Now if I treat graphic.php as an image, and reference in another page graphic.php *is* an image, just like, any other image. So you should treat it like an image. > my_graphic.png is no longer displayed and the web page gets filled > with > random characters. If you had a PNG, and if you opened up that file in Notepad/BBEdit/vi and you copied all the stuff out of it and pasted it into your HTML, that's pretty much what you would get, right? Just like you just did with PHP doing the "paste" Now, one little caveat: Microsoft, in its infinite wisdom, frequently IGNORES the "Content-type:" head from the HTTP specification in various versions of Internet Explorer. Instead, MS IE will examine the URL and see: graphic.php and say, "Oh, never mind that silly HTTP specification and Content-type, *this* must be a .php file because it ends in .php, and everybody uses 8.3, right?" Then, of course, MS IE says, "Oh my goodness! I don't know how to handle a '.php' file! Woe is me!" and then pops up a Window telling the user it has encountered a file of type .php and doesn't know what to do with it. [I'll tell 'em what to do with it... :-)] Anyway, if you're going to do much with dynamic images, you might as well start getting them to have ".png" filenames now. There are lots of techniques for this, but the whole ignoring Content-type mess of MS IE, and because of their similar idiocy with GET parameters for .pdf and .swf files, I recommend this: Make your HTML and your URL indistinguishable from static HTML/URL, so that MS IE can't *possibly* [bleep] up. Put this in an .htaccess file next to the graphic.php script: ForceType application/x-httpd-php Now, rename graphic.php to graphic.png Voila. MS IE "sees" graphic.png and "knows" it's a PNG. Apache was told that graphic.png is *really* a PHP script, so Apache fires up PHP and PHP/GD make the image and spit it out. Your HTML and PNG are indistinguishable by the browser from a static image, and they'd have to break every PNG out there to make yours not work. Which, knowing MS, is not *impossible* but it's a lot less likely than their various versions of IE that will break on http://example.com/graphic.php as a PNG image URL. -- Like Music? http://l-i-e.com/artists.htm -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] how to display GD graphic in web page
On Mon, 2005-10-24 at 20:14 -0400, Chris wrote:
> I don't understand what is going on with a simple example I created to
> understand how GD graphics are presented in a web page.
[[snip]]
> However if I replace:
>
>
> with
>
> $image = imagecreatefrompng("my_graphic.png");
> imagepng($image);
> ?> >
>
> my_graphic.png is no longer displayed and the web page gets filled with
> random characters.
>
> Why is this happening or what am I missing.
You're not missing anything. That is exactly the expected behaviour. You
can call graphic.php with GET variables if you need to pass information
on, but you can't put images inline like that except for with data:
URIs.
data: URIs are currently only supported by Gecko browsers (Mozilla,
Firefox, etc) and maybe Safari or Opera (not sure about the latter two).
Do a search for "data: URI RFC" or similar to find out about them.
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[PHP] how to display GD graphic in web page
I don't understand what is going on with a simple example I created to understand how GD graphics are presented in a web page. First I created the following simple script (in a file named graphic.php): // file: graphic.php I load that script with my web browser, the image is displayed as expected. Now if I treat graphic.php as an image, and reference in another page using the tag as in the following: // my_page.php Untitled Document The page again displays my_graphic.png. However if I replace: with > my_graphic.png is no longer displayed and the web page gets filled with random characters. Why is this happening or what am I missing. Thanks for any insight. Chris -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
