PHP static variable as a result of another function

Question

I am trying to define a PHP class with some static variables. I am trying to do the following to avoid using globals.

class class_Name{
  private static $var1 = is_plugin_inactive('plugin/plugin.php'); //check if WordPress has this plugin active
  public static function doSomeStuff(){
    echo $var1;
  }
}
//init class
class_Name::doSomeStuff();

This always get's me an error Parse error: syntax error, unexpected '(', expecting ',' or ';' in my_file.php at line where I am defining the static variable.

Any help please.

Class vars defined there must be constant expressions. Try assigning it in the function. — AbraCadaver
– AbraCadaver, Commented May 13, 2015 at 20:37
I need the variable to be defined outside the doSomeStuff function so I can use it in several other functions. Thanks — thednp
– thednp, Commented May 13, 2015 at 20:38
Typo. You call doSomeStuff but in the class the name is doSomStuff. — Muhammad Abdul-Rahim
– Muhammad Abdul-Rahim, Commented May 13, 2015 at 20:40

cwurtz · Accepted Answer · 2015-05-13 20:50:07Z

1

Not sure of your exact situation, but can you do:

class class_Name {
    private static $var1 = null;   

    //check if WordPress has this plugin active
    public static function doSomeStuff(){
        if(is_null(self::$var1))
            self::$var1 = is_plugin_inactive('plugin/plugin.php');
        echo self::$var1;
    }
}

Basically call the function like you are wanting to, but initialize it if its not already?

answered May 13, 2015 at 20:50

cwurtz

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steven · Accepted Answer · 2015-05-13 20:45:54Z

1

if you like to save a non constant expression in $var1 you need to set in from a method, for example an init method:

class class_Name {

    private static $var1 = null;

    public static function init() {
        self::$var1 = is_plugin_inactive('plugin/plugin.php');
    }

    public static function doSomeStuff() {
        echo self::$var1;
    }

}

class_Name::init();

class_Name::doSomeStuff();

answered May 13, 2015 at 20:45

steven

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