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Performance issues using classes in php?

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Performance issues using classes in php? Discuss here techniques and methods used to program effectively. Questions in this forum should be more like 'How do I build a better...' rather than 'This code doesn't work, how do I fix it?'

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  #1  
Old November 20th, 2006, 07:46 PM
maxshooter maxshooter is offline
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Performance issues using classes in php?
Hi there, can anybody help me on these questions?

1. When a class is loaded, does it load every function into memory.?
2. Which one is best of the 2 examples given below, based on
a) Fast execution
b) low memory or resources required
c) overall performance (ie. fast execution and low resources consumption)
php Code:
Original - php Code 
  1.  
  2. Example A:
  3. ===========
  4.  
  5. file: myclass.php
  6. -----------------
  7. clase myclass
  8. {
  9.     function xyz()
  10.     {
  11.         blah;
  12.         blah;
  13.         ..... and so on upto 100s of lines of code
  14.     }
  15.        function abc()
  16.        {
  17.          echo "hello world";
  18.        }
  19. }
  20.  
  21. Example B:
  22. ==========
  23.  
  24. file: myclass.php
  25. -----------------
  26.  
  27. clase myclass
  28. {
  29.     function xyz()
  30.     {
  31.       include(blah.php);
  32.     }
  33.        function abc()
  34.        {
  35.          echo "hello world";
  36.        }
  37. }
  38.  
  39. file: blah.php
  40. --------
  41. <?php      
  42.     blah;
  43.     blah;
  44.         ..... and so on upto 100s of lines of code
  45. ?>

As you've noticed in the above 2 examples that Class in A is having all the statements inside a function.
While Class in B is including a seperate file (dynamically).

It is obvious that they won't make much difference when function xyz is called, on the performance.

But what is the best way to implement a class when most of the time we have to call function abc() and rarely function xyz()?
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Old November 27th, 2006, 09:30 AM
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RE: Performance issues using classes in php?
purely performance wise - procedural is better (generally speaking)- faster, less memory and less overhead. But objects are much better (again generally speaking) for maintainability and reusability.

When an object is instantiated it's data and methods are placed in memory for each object. When a function file is included - all the functions are moved into memory - even the ones you don't use.
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