SIMPLE PHP TUTORIAL! (from me!)

[freshtokyo]

checkity this boys and (girls?)
say you got a gallery page, or any page that you'd normally link out to a bunch of other pages containing the data. DO THIS INSTEAD!

<?php
	$image = "";
	if ( $_GET['class'] == "test") {
?>
	test image! [img]test.jpg[/img]
	
back
<?
	} elseif ( $_GET['class'] == "test2")  {
?>
	test image 2! [img]test2.jpg[/img]

<?
	} else {
?>
This is what the page displays to start with
links should be something like this link or image

<?
}
?>

Ok ok, that might be the most basic code, but after I did it, I couldn't help think of all the other things I can use it for using different variables from other pages, or use it whilst pulling info from a db!?! rock and roll (note to all: don't copy and past this code from this browser window, as tek and I have found out... it fucts it up)

[freshtokyo]

questions comments suggestions welcome

[JD]

I don't know what that means. What a meaningful comment.

[freshtokyo]

I'm just looking for input on that code (aka, could it be done simpler, etc)

[Tekime]

fresh my man I'm glad to see you're getting into this PHP thing so much.

Check it out though, I'm going to show you a different way to handle this kinda of thing.

Basically, this script is just taking an image name identifier and showing the correct image for it, no? Why not take this dynamic thing all the way and save ourselves a few more lines?

<?php

if($_GET['img'])
{    
    $image_dir = "/var/www/public_html/images/"; // Absolute URL   
    $image_rel = "images/"; // Relative URL

    $file = addslashes($_GET['img']); // Clean up filename

    if(file_exists($image_dir.$file))
    {
        echo "<img src=\"".$image_rel.$file."\" />";
    }
    else
    {
        echo "Error reading imagefile";
    }

}

echo "<a href=\"index.php\">Go Back</a>";

?>

Just off the top of my head, but now you can specify ANY imagename and it will automatically check for it before displaying it. No more control structures for each and every name!

That is if this is what you were trying to accomplish of course.

[freshtokyo]

that is pretty dope, and I would use that in an image gallery, (althought the actually application I'm using the code I posted can't be as dynamic unless I pull it from a db, but that's cool)

[freshtokyo]

hey, what does "addslashes" do?

[Tekime]

addslashes() is used for escaping characteres so visitors don't have such an easy time of injecting malicious code into your scripts:

http://us3.php.net/addslashes

DEFINITELY worth understanding, it's very useful.

[freshtokyo]

I figured it had something to do with that. thx mango