PHP - Predefine an array at the begining of a class for all methods to use

Question

I have a method within a class that returns a single array. This method is called within other methods inside the same class. Rather than keep defining $data at the begining of each method, is there a way og defining it at the begining of the extended class? Here is an example of what I'm trying to achieve [simplified]

class Myclass extends AnotherClass
{
    protected $data = $this->getData(); // this does not wwork

    public function aMethod()
    {
        $data = $this->getData();

        $data['userName'];

        // code here that uses $data array()
    }

    public function aMethod1()
    {
        $data = $this->getData();

        // code here that uses $data array()
    }

    public function aMethod2()
    {
        $data = $this->getData();

        // code here that uses $data array()
    }

    public function aMethod2()
    {
        $data = $_POST;

        // code here that processes the $data
    }

    // more methods
}

You can set it in the __construct() function, then it'll be available to use for all the methods. — Erik
– Erik, Commented Sep 19, 2014 at 9:45

davidkonrad · Accepted Answer · 2014-09-19 09:47:02Z

2

Well, maybe I miss something, but normally you would instantiate such variable in a constructor :

public function __construct() {
    $this->data = $this->getData();
}

answered Sep 19, 2014 at 9:47

davidkonrad

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2 Comments

Zeusarm Over a year ago

This will not work as you are overriding the parent class constructor and getData() method is undefined.

user3770579 Over a year ago

Correct @Zeusarm, I tried this and had a suede of errors as I was overrdindg the parent contract as you so rightly point out

Zeusarm · Accepted Answer · 2014-09-19 10:22:02Z

1

Try to put that assignment in the class constructor:

class MyClass extends AnotherClass {
    protected $variable;

    function __construct()
    {
        parent::__construct();
        $this->variable = $this->getData();
    }

}

** UPDATE **

You can also try the following

class MyClass extends AnotherClass {
    protected $variable;

    function __construct($arg1)
    {
        parent::__construct($arg1);
        $this->variable = parent::getData();
    }

}

According to your Parent class you need to pass the needed arguments

edited Sep 19, 2014 at 10:22

answered Sep 19, 2014 at 9:46

Zeusarm

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1 Comment

user3770579 Over a year ago

This causes a fata error because it breaks other methods within my class.

Roger Guasch · Accepted Answer · 2014-09-19 10:04:59Z

0

class Myclass extends AnotherClass{

   protected $array_var;

   public __construct(){
      $this->array_var = $this->getData();
   }

   public function your_method_here(){
      echo $this->array_var;
   }
}

edited Sep 19, 2014 at 10:04

answered Sep 19, 2014 at 9:49

Roger Guasch

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2 Comments

Marcus Rickert Over a year ago

A few explaining sentences would be helpful. :-)

Roger Guasch Over a year ago

I think is clear...when you create the class "Myclass" automatically (with your constructor you have a variable "array_var" populated with the function "getData"

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