Plugin Hooks - Ideas/help wanted

First of all, I know this a very complex script and don't expect anyone to give me the completed script. I just need pointers on how to acomplish it, and maybe some sample code . I have known since I thought of this that it is way out of my knowledge.

Lets dive straight into the good stuff. Here is the code I want to work:

<?php
//Define the class - no idea what to call it, so I'll just use ClassName :p
$plugin = new Hooks;

//Set the hook
$plugin->set_hook("awesome","hook()");

function hook()
{
echo "nice day";
}

echo "Hello world, it is a ";
//Uses the hook "awesome" - which runs the function hook()
$plugin->use_hook("awesome");


?>

PHP:

The output of that would be: Hello world, it is a nice day.


Currently, all I have in my class is:

<?php
class Hook{
function set_hook($hookname,$function){}

function use_hook($hookname){}

}
?>

PHP:

Obviously that does crap all.

There are many, many things I don't get in this - I have no idea what functions to use, or how to use them, whether regex or arrays will be involved, or how to convert the $function from a string to a function.

Any basic examples would help me majorly, and anyone who does manage to help me shall receive a link to their website in the "Major Contributor" section of the script ACP - it will only be a script shared to a select few (CMS), but it may help you out with a few things.

Now, hooks a hard for me to explain, I understood them, and figured out how useful they would be to have in my script - which may or may not be tightly integrated with MyBB.


So, I really need help from very good coders now, as I am (for the first time ever) - so lost I can't even think of anything to try.


BP

 

Well I have consulted with people, and I do not think this is possible for me to do at all, as t involves array, calling functions from that array etc etc. Probably around 40-50 lines of code in total...but complicated. This does annoy me greatly. I have never had a code so hard that I can't even think about how to do it

 

Try this :

<?php
class Hook{

	function set_hook($hookname,$function){
		$this->$hookname = $function;
	}
	
	function use_hook($hookname){
		call_user_func($this->$hookname);
	}

}

$plugin = new Hook;

//Set the hook
// Note : dont have brackets for the function name
$plugin->set_hook("awesome","hook");

function hook()
{
	echo "nice day";
}

echo "Hello world, it is a ";

//Uses the hook "awesome" - which runs the function hook()
$plugin->use_hook("awesome");


?>

PHP:

Worked for me

 

Seriously though? That easy?


I was looking at complex arrays and using call_user_func_array. This simplifies things a lot.

There is a bug though, if the hook does not exist, you get this error:

Warning: call_user_func() [function.call-user-func]: First argument is expected to be a valid callback in W:\www\cms\admin\test.php on line 9

Code (markup):

.

I am off to be now, though I'll leave you some nice, shiny green rep first

 

Of course you get an error. How do you want to use a function that doesn't exist?

If you want to check if it exists, you can do:

if (function_exists($this->hookname))
{
    call_user_func($this->hookname);
}
else
{
    // Handle error
}

PHP:

 

Yeah I know that. Though technically the function exists, but the hook doesn't

Either way, I can troubleshoot this by myself now.

Thanks all

BP

 

Apparently, I've never done something like it until just now, and actually, it helped me too. Make it a bit friendlier like nico said though

 

Yeah I have extended it a little bit, and I am commenting it myself - so I understand it much better. Thanks again.