PHP - Making Class Object Global Throughout Entire Application?

Question

Is there a simple way to make a class object global for an entire application in PHP? I need my class to only be able to be instantiated once throughout the entire application and have it working 100%.

Thanks.

EDIT

Decided the Singleton pattern is the best idea for what I need, and was requested to add a bit of code so here it is:

Using the class in my app:

function catp_check_request(){
    $catp=catp::getInstance();

    $dlinks=array();
    $ddlinks=array();

    foreach($catp->rawlinks->link as $rawlink){
        $dellink="catp-del-{$rawlink->name}";
        array_push($dlinks,$dellink);
    }

    // More stuff..
}

Declaring the class:

class catp {

private static $instance;
private $errors;
private $status_messages;
private $plugin_name;
private $plugin_shortname;
private $links;
private $linksurl;
private $rawlinks;

private function __construct(){}

public static function getInstance() {
    if (self::$instance == null) {
        self::$instance = new catp();
    }
    return self::$instance;
}

public function catp(){
    $this->errors=false;
    $this->plugin_name='CloakandTrack Plugin';
    $this->plugin_shortname='CaTP';
    $this->status_messages=array(
        'updated' => 'You just updated',
        'enabled' => 'You just enabled',
        'disabled' => 'You just disabled',
        'debug' => 'Plugin is in debug mode'
    );
    $this->linksurl=dirname(__FILE__).'/links.xml';
    $this->rawlinks=simplexml_load_file($this->linksurl);
    $this->links=$this->catp_parse_links($this->rawlinks);
}

// More functions..

}

Eugene Manuilov · Accepted Answer · 2011-07-17 08:16:10Z

7

You need singleton object.

class YourClass { 
    private $_instance = null;

    public static function getInstance() {
        if (self::$_instance == null) {
            self::$_instance = new YourClass();
        }
        return self::$_instance;
    }
}

// to get your instance use
YourClass::getInstance()->...;

Check this link for more details http://www.php.net/manual/en/language.oop5.patterns.php#language.oop5.patterns.singleton

answered Jul 17, 2011 at 8:16

Eugene Manuilov

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3 Comments

Jared Over a year ago

This looks like exactly what I need. I tried switching my code over to look similar to the link you provided me with, but now I am getting these kinds of errors: Fatal error: Cannot access private property catp::$rawlinks in . . . - Is this something that happens commonly? It seems each variable is actually returning NULL.

Eugene Manuilov Over a year ago

You need to make your variables in class public or write get method for each. public $rawlinks; or public function getRawlinks() { return $this->rawlinks; }

dotNET Over a year ago

Maybe you need to declare $_instance with static. I'm not a PHP guy, but in several other languages that I have used, instance variables cannot be accessed in static functions.

Community · Accepted Answer · 2017-05-23 10:33:50Z

2

See the singleton pattern on SO (and in which cases it is considered bad practice).

You may consider also using registry.

Note that your problem might be an architectural one and maybe there are better ways to solve the problem you face, e.g. dependency injection container.

edited May 23, 2017 at 10:33

CommunityBot

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answered Jul 17, 2011 at 8:13

takeshin

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Comments

armandomiani · Accepted Answer · 2011-07-17 08:11:56Z

0

You can use __autoload feature to include the class dynamically for you.

http://www.electrictoolbox.com/php-autoload/

answered Jul 17, 2011 at 8:11

armandomiani

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1 Comment

Ondrej Slinták Over a year ago

that doesn't instantiate it for him

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