Passing of variables around...

[Grofit]

Hi there,

Im fairly new to PHP (2 days exp with it), ive had 4 years xp with C/C++ though, so im sorry if my terminology is a bit whack or im just doing things php doesnt allow.

Anyway here is my main problem:

//Class_File.php

class PHPClass
{
 var $String1;

 function PHPClass($RandomString){$String1 = $RandomString;}
 function Print_String() {echo $String1;}
};

//Web_Page.php
require("Class_File.php");
$String = "PHP is cool";

$PHPObject = new PHPClass($String);
$PHPObject->Print_String();

//echo $String;

right then... with the above code in its current state it just creates a page with no source code. im sure there is a really good reason why but i just cant see it. However if i uncomment the line:

//echo $String;

It shows "PHP is cool" in there, so how come it wont display this when its in the class? anyway i hope this shows you what im attemping to do...

Any help would be great.. lol as im stumped..

[devinemke]

there are number a ways of doing this, for example:

class PHPClass
{
	var $string;
	function Print_String() {echo $this->string;}
}

$PHPObject = new PHPClass;
$PHPObject->string = 'PHP is cool';
$PHPObject->Print_String();

[Grofit]

ok thanks for that...

as i said im used to C++ so im guessing that PHP needs the "$this->function()" as it doesnt always know what calls it or something... anyway whats so different about:

$PHPObject->String = "PHP Is Cool";

and

// function Set_String($Random_String) {$String = $RandomString;}
$PHPObject->Set_String("PHP is Cool");

they both do the same thing but one is in a class one isnt... anyway i guess it works..lol im just a bit puzzled as to some of PHP capabilities.. thanks though 🙂

[tsinka]

Hi,

the PHP manual on www.php.net contains some useful info about classes. Here's an example:

<?PHP
error_reporting(E_ALL);
//Class_File.php

class PHPClass {
  var $String1;

  function PHPClass($RandomString = "") {
    $this->String1 = $RandomString;
  }

  function setString1($value) {
    $this->String1 = $value;
  }

  function getString1() {
    return $this->String1;
  }

  function printString1() {
    echo $this->String1;
  }
}

$objPHPClass = new PHPClass("a string");

$strString1 = $objPHPClass->getString1();
echo $strString1."<br>\n";
$objPHPClass->printString1();
echo "<br>\n";


// !!! PHP5 only !!!
class PHP5Class {
  private $String1;

  public function PHP5Class($RandomString = "") {
    $this->String1 = $RandomString;
  }

  public function setString1($value) {
    $this->String1 = $value;
  }

  public function getString1() {
    return $this->String1;
  }

  public function printString1() {
    echo $this->String1;
  }

  public function addString($value = "") {
    $this->privateMethod();
    $this->String1 .= $value;
  }

  private function privateMethod() {
    $this->String1 .= "---";
  }
}

$objPHP5Class = new PHP5Class("a string (PHP5)");

// the following two lines doen't work
// $objPHP5Class->String1 = "doesn't work";
// $objPHP5Class->privateMethod();

$strString1 = $objPHP5Class->getString1();
echo $strString1."<br>\n";
$objPHP5Class->addString("add this");
$objPHP5Class->printString1();
?>

Thomas

[Grofit]

yeah all makes sense now... i think i will get a little more used to PHP4 atm but 5 just looks like its incorporating more private/public/protected abilities for classes.

Now im moving on to sessions, but they dont seem to want to work when i use forms... lol oh well until next time.. thanks all 🙂

[Weedpacket]

Originally posted by Grofit
yeah all makes sense now... i think i will get a little more used to PHP4 atm but 5 just looks like its incorporating more private/public/protected abilities for classes.

Oh, there are some other changes going from v4 to v5; one of the most significant being that objects are automatically passed by reference in v5, while being passed by value in v4 if you don't specify otherwise.

[tsinka]

Do you have Linux/Apache or Windows with Apache/IIS (or a completely different OS) ?

There's a package available:

www.xampp.org/en

That's package is available for Linux, Windows and Solaris and you can switch between PHP4 and PHP5 with just one click (Windows) which makes it easier to play around with both PHP4 and PHP5.

Thomas

[Grofit]

im win/apa

[tsinka]

Then xampp might be a good choice since it comes with nearly everything you need and you can switch between PHP4 and PHP5 (with different php.ini configurations) with just one click.