Re: Re: Basics of OOP

Nathan Rixham schreef:

Ben Stones wrote:

Hi, The following bit of code doesn't output anything: <?php

    class output {
        var $text;
        function outputText() {
            $this->text = "Hello World";
            echo $this->text;
        }
    }

    $class = new output();
    $class->outputText;

?> As well as the following code: <?php

    class output {
        var $text=5;
        function outputText() {
            echo $this->text;
        }
    }

    $class = new output();
    $class->outputText;

?> Am I doing anything wrong? By the way, the preceding code is just so I understand OOP which finally I've grasped, but am I doing anything wrong as both codes don't output anything?

it's the lack of a methodCall() $class->outputText; <<don't work

$class->outputText; references an undefined property of the class instance, turning on error_reporting to full (i.e. including E_NOTICE) would have given a hint to the OP (assuming he has display_error ON or he is reading his error log) as to what was going on. as an example, try running this: <? class Foo { public $a = "A\n"; private $b = "B\n"; static $d = "D\n"; function b() { echo $this->b; } static function d() { echo self::$d; } static function e() { echo "E\n"; } } ini_set('display_errors', true); ini_set('error_reporting', E_ALL ^ E_STRICT); $f = new Foo; echo $f->a; echo $f->b(); echo $f->c; echo $f->d(); echo $f->d; echo Foo::d(); echo Foo::$d; echo $f->e(); echo Foo::e(); // the following are fatal errors: echo $f->b; echo Foo::b(); ?>

$class->outputText(); <<will work while you're there why not learn the php5 way?

quite right :)

<?php class output { private $text; public function outputText( $text='default text' ) {

    $this->text = $text;
    return $this->text;

} } $class = new output; $class->outputText(); ?> just a suggestion save you double learning! good choice on the OO though nathan