variable inside a variable in a php class

Question

is it possible to copy a variable like this this?

class Colours {
   var $var = "one";
   var $var2 = array('something', $var);
}

Unrelated side note: PHP 4 is pretty old; you should be using the PHP 5 OOP syntax unless you're maintaining legacy code. — Álvaro González
– Álvaro González, Commented Mar 22, 2010 at 10:29

Andy Shellam · Accepted Answer · 2010-03-22 10:18:25Z

6

The preferable way is to do this in the constructor of the Colours class. I'm not sure in PHP, but in other languages the order of initialisation of the variables should not be relied upon.

class Colours 
{ 
    private $var;
    private $var2;

    public function __construct()
    {
        $this->var = "one";
        $this->var2 = array('something', $this->var);
    }
}

answered Mar 22, 2010 at 10:18

Andy Shellam

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Comments

Adam Hopkinson · Accepted Answer · 2010-03-22 10:18:12Z

2

You'd need to use $this->var to access the variable

class Colours {
   var $var = "one";
   var $var2 = array('something', $this->var);
}

answered Mar 22, 2010 at 10:18

Adam Hopkinson

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1 Comment

Pekka Over a year ago

This won't work because at the time of class declaration, there is no $this present yet.

muruga · Accepted Answer · 2010-03-22 10:18:32Z

0

 <?php
     $var = "one";
     $var2 = array('something', $var);
    print_r($var2)
    ?>


 I got the following output 



     Array 
    (
            [0] => something
            [1] => one
    )

answered Mar 22, 2010 at 10:18

muruga

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1 Comment

JonnyLitt Over a year ago

He means in a class. In which it would be $this->var.

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