Static, Global

[shamuntoha]

function ..() {

global $all_pages;

}

 

is global inside function, same like outside functions to define?

 

 

 

[gevans]

A global variable is made available to all parts of a script. If you set the variable outside the function, you can set it to a global variable inside the function to make it available

[shamuntoha]

index.php

global $a;

 

class.php

function called_from_index() {

  & $a = 4;

}

 

do you mean from above, i have to use global to change the $a?

 

[gevans]

yes, if you want to change $a within the function you have to set it as global, but you need to do this inside the function

[PFMaBiSmAd]

Please don't use global to being variables into your function or even worse, a class. If you have data that is that closely related to the operation of the function/class, you should be using a class and the variables should be class variables and not main program variables.

[shamuntoha]

Thanks to all, but i read a article that storing inside class, cause memory or performance issues ? like not all programs need OOP.

[DarkWater]

Thanks to all, but i read a article that storing inside class, cause memory or performance issues ? like not all programs need OOP.

 

Then don't use OOP?  I honestly don't think that there's a real memory hit in storing an int referenced by a class or just a random int in the main scope of the script...

[waynewex]

You won't have to worry about those kind of performance issues unless your site is popular, and by then you'll be rich enough to hire another programmer! =)

[shamuntoha]

Many thanks for comments.

 

some sites benchmerk show things slowing down while using lot of things which is not thought more before creating it, where i am doing a open source project for VML, XML, SVG, JS (respecting large hits).

 

http://www.php.lt/benchmark/phpbench.php

 

do we care those staff while doing php?

 

 

[premiso]

Thanks to all, but i read a article that storing inside class, cause memory or performance issues ? like not all programs need OOP.

 

It depends on what you are doing. Classes can be very efficient for certain tasks and not slow it down. Yes, using many many classes that are unecessary and instantiating them all at once is slow.

 

But for certain tasks, such as a DB connection, where you want to handle errors and have an easy way to get data out without having to repeat 10-15 lines of code each time is well worth it.

 

Just think, "Do I really need this class?". For a game script a class can be very nice cause you can use it to keep track of user data and what changed etc and only have to update it when needed, not to mention you can just keep passing the data via session using serialize and avoid having to make a ton of DB calls to keep retrieving data etc.

 

It just depends =)

[Mchl]

The benchmark you posted would be a lot more interesting, if it was running on some recent PHP version.

A lot has changed since  4.0.6.

[flyhoney]

I would almost always choose the OOP route, just because it makes code way more manageable and understandable.  If you are writing very small simple scripts, than it is not really worth it.  But sometimes, small simple scripts turn in to large confusing ones.

 

If you are looking for performance, than maybe you should consider moving away from PHP.  If you are doing image processing and other CPU intensive things, you should write those programs in C or C++ and then exec them from the PHP.

 

"We should forget about small efficiencies, say about 97% of the time: premature optimization is the root of all evil." - Knuth, Donald

[PFMaBiSmAd]

I'll second what flyhoney posted. You code for functionality first, optimization last.

 

If you are concerned about the few 10's of milliseconds or few 100's of bytes of memory that using OOP in php adds, then you should not be using slow parsed/tokenized/interpreted php code at all for your application.