using a static class with properties in php

Question

I'm trying to get the selected language to appear in a link with the function buildMenu().

I would like to use it as a static function so I can call it in my header template. If I call the function in the init() function it all works fine, however, when I try to use it as a static function, nothing works anymore. I've tried everything I know, so it seems my knowledge of php ends there :)

Any of you got any tips? Thanks in advance!

class bootstrap {

    static public $lang;
    static public $class;
    static public $method;

    public function init(){
        $url = isset($_GET['url']) ? $_GET['url'] : null;
        $url = rtrim($url, '/');
        $url = filter_var($url, FILTER_SANITIZE_URL);
        $url = explode('/', $url);

        //Set values on startup
        if($url[0] == NULL) {$url[0] = 'nl';}
        if($url[1] == NULL) {$url[1] = 'index';}

        if(isset($url[0])) {$this->lang = $url[0];}
        if(isset($url[1])) {$this->class = $url[1];}
        if(isset($url[2])) {$this->method = $url[2];}        

        $this->loadClass();

    }

    public function loadClass(){

        $filename = 'libs/' . $this->class . '.php';
        if(file_exists($filename)){
            $newController = new $this->class($this->lang, $this->class, $this->method);
            $newView = new view($this->lang, $this->class, $this->method);
        } else {
            $newclass = new error($this->lang, $this->class, $this->method);
        }

    }


    public function buildMenu(){
        echo '<li><a href="http://localhost/testing/' . $this->lang . '/foto">Foto</a></li>';
    }

    /*
     * Set paths
     */

    public static function root(){
        echo "http://localhost/testing/";
    }

}

self::$lang, self::$class, ...

elclanrs
– elclanrs

2013-09-21 22:10:01 +00:00
Commented Sep 21, 2013 at 22:10 — elclanrs
– elclanrs, Commented Sep 21, 2013 at 22:10

GordyD · Accepted Answer · 2013-09-21 22:52:20Z

1

You are using the object operator (->) instead of the scope resolution operator (::) that is used to reference class constants and static properties or methods.

See here for an explanation of the static keyword and working with static properties.

Update your code to this:

class bootstrap{

  static public $lang;
  static public $class;
  static public $method;

  public function init(){
    $url = isset($_GET['url']) ? $_GET['url'] : null;
    $url = rtrim($url, '/');
    $url = filter_var($url, FILTER_SANITIZE_URL);
    $url = explode('/', $url);

    //Set values on startup
    if($url[0] == NULL) {$url[0] = 'nl';}
    if($url[1] == NULL) {$url[1] = 'index';}

    if(isset($url[0])) {self::$lang = $url[0];}
    if(isset($url[1])) {self::$class = $url[1];}
    if(isset($url[2])) {self::$method = $url[2];}       

    $this->loadClass();

  }

  public function loadClass(){

    $filename = 'libs/' . self::$class . '.php';
    if(file_exists($filename)){
        $newController = new self::$class(self::$lang, self::$class, self::$method);
        $newView = new view(self::$lang, self::$class, self::$method);
    } else {
        $newclass = new error(self::$lang, self::$class, self::$method);
    }

  }


  public static function buildMenu(){
        echo '<li><a href="http://localhost/testing/' . self::$lang . '/foto">Foto</a></li>';
  }

  public static function root(){
    echo "http://localhost/testing/";
  }
}

edited Sep 21, 2013 at 22:52

answered Sep 21, 2013 at 22:19

GordyD

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2 Comments

Axll Over a year ago

Doesn't it give an error on the line of "$newController = new self::lang(self::$lang, self::$class, self::$method);" ?

Axll Over a year ago

Works like a charm, thx! And thx for the info between the object operator and scope resolution operator :)

George Brighton · Accepted Answer · 2013-09-21 22:19:00Z

0

As @elclanrs has already mentioned, how about changing the buildMenu() method to

public static function buildMenu(){
    echo '<li><a href="http://localhost/testing/' . self::$lang . '/foto">Foto</a></li>';
}

You can then call it using bootstrap::buildMenu().

answered Sep 21, 2013 at 22:19

George Brighton

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