Question about function

[JongMin]

Hi, all

 

Please look at the code below:

 

*** test.class.php ***

 

class Test

{

    public $test1;

    public $test2;

    public $test3;

 

   function getTest1()

   {

       return $this->test1 = 'Test.';

   }

 

   function getTest2()

   {

       $this->test2 = 'Test.';

    }

 

   function getTest3()

   {

       echo  'Test.';

    }

 

}

 

 

*** test.php ***

<?php

 

require_once("test.class.php");

 

Test = new Test();

 

// prints Test on the screen

echo Test->getTest1(); 

 

// prints Test on the screen

echo Test->getTest2();

 

// prints Test on the screen

Test->getTest3();

 

Q1. What is the difference between getTest1() and getTest2()?

 

Q2. Which one is the best way to call the function among these functions for the system performance?

 

Thanks in advance

Edited June 28, 2013 by JongMin

[requinix]

A1.

// prints Test on the screen
echo Test->getTest2();

No it doesn't.

 

A2. Irrelevant because all three do slightly different things: first sets a value and returns it, second just sets a value, third just returns a value.

[JongMin]

Sorry wrong question;

ignore the original question and see below:

 

*** test.class.php ***

 

class Test

{

    public $test1;

    public $test2;

 

   function getTest1()

   {

       return $this->test1 = 'Test.';

   }

7

   function getTest2()

   {

       $this->test2 = 'Test.';

    }

 

   function getTest3()

   {

       echo  'Test.';

    }

 

}

 

 

*** test.php ***

<?php

 

require_once("test.class.php");

 

Test = new Test();

 

// prints Test on the screen

echo $Test->test1; 

 

// prints Test on the screen

echo $Test->test2; 

 

// prints Test on the screen

Test->getTest3(); 

 

Q1. What is the difference between getTest1() and getTest2()?

 

Q2. Which one is the best way to call the function among these functions for the system performance?

Edited June 28, 2013 by JongMin

[Irate]

Q1. As requinix said, these functions do all very similar tasks.

getTest1() returns a value, getTest2() assigns a value to a variable. If you echo both, you get the same results.

 

Q2. If you are just interested in echoing 'Test', then getTest3() is the fastest as it doesn't inherit any object's methods, doesn't work with variables, it just straight-out echoes 'Test'.

Otherwise getTest1() should be the fastest, based on approximated logical conclusions.