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Could someone explain following stuff for me (eval and functions)

Could someone explain following stuff for me (eval and functions)

Could someone explain following stuff for me (eval and functions)

Hello people,

I am pretty new to PHP,

I have made following pages

contains following code:





function foo()
	echo "asdasdd";


<a href="pag2.php">link </a> 

Below is my code for pag2.php







'eval' does that mean you check if the PHP code is valid?
(I believe you use the 'eval' to check for errors ? correct me if I am wrong)

If I don't want to use the 'eval', just call the function (foo)
how should I write the code instead?

Thank you in advance

RE: Could someone explain following stuff for me (eval and functions)

I think I got it though..

I got this code:



<meta charset="UTF-8">





CODE --> php


function getpage(){

	echo "this is info from pag2.php";


RE: Could someone explain following stuff for me (eval and functions)


Means evaluate the text string in the session value named 'foo' and apply it as if if it were a line of php code.

However that IS a rather foolhardy and potentially dangerous (for your server or site) way of using evaluate, simply because it could possibly be used by an attacker to execute arbitrary code in the context of your website user account.

Overuse of eval() in the core code is one of the things that makes WordPress such an easy target for malicious 'hackers', because any sensible and responsible server manager would disable the eval function globally [in php.ini], but WordPress makes this impracticable because then WordPress will not run and requires individual php.ini files to enable it, which negates the security aspect of the global block.


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RE: Could someone explain following stuff for me (eval and functions)


Structuring your code is really a "very personal" habit or preference. Take for example:


Each of the above could be directories where you would keep files based on their respective types and/or use within your application. So, you can use include(), require(), require_once() to load the needed documents when needed and in the order they are needed thus basically concatenating (if you will), a PHP script based on needs/requirements.

A nice thing about the use of these approach is that you can set a variable (say $home='1200 SE 32nd Ave.') and upon loading a 2nd script, the variable will be accessible without having to declare it as global.

Do get use to using isset() prior to referencing any variable or object to avoid warnings and/or errors.

One UDF I put together to take advantage of small PHP scripts and get their resolved content upon request is


function getresolved($page) {
       if(file_exists($page)) {        
        include $page;
        $content = ob_get_contents();
        return ($content);
       } else { return(0); }

Again, all of this is a matter of preference/habit but I hope this gives you an idea of how to structure your project and how to best load/call processing scripts throughout your application.

PS: Credit to above method goes to a member of this very forum (I think vacunita or feherke ...) from many years ago!

The good thing about not knowing is the opportunity to learn - Yours truly, 2008.

RE: Could someone explain following stuff for me (eval and functions)

Hi Southbeach@,

I have never thought about if PHP have a certain structure in PHP code intresting :)
I know there is example in dot.net different models you work with (MVC etc)...
Could you provide me with more information if there is a certain way you work with php code?

Thank you in advance.

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