PHP - Set class variable from another class variable within same class?

Question

I'm trying to set up a PHP class:

class SomeClass {
    private $tags = array(
        'gen1' => array('some string', 1), 
        'gen2' => array('some string', 2), 
        'gen3' => array('some string', 3), 
        'gen4' => array('some string', 4), 
        'gen5' => array('some string', 5), 
    );

    private $otherVar = $tags['gen1'][0];
}

But this throws the error:

PHP Parse error: syntax error, unexpected '$tags'

Switching it to the usual...

private $otherVar = $this->tags['gen1'][0];

returns the same error:

PHP Parse error: syntax error, unexpected '$this'

But accessing the variable within a function is fine:

private $otherVar;

public function someFunct() {
    $this->otherVar = $this->tags['gen1'][0];
}

How can I use the previously defined class variable to define and initialize the current one, without an additional function?

the proper way is using the last code block, it must be able to be evaluated at compile time and must not depend on run-time, de2.php.net/manual/en/language.oop5.properties.php — Kevin
– Kevin, Commented Oct 6, 2016 at 1:35

Rax Weber · Accepted Answer · 2016-10-06 01:50:12Z

3

The closest way to do what you desire is to put the assignment in the constructor. For example:

class SomeClass {
    private $tags = array(
        'gen1' => array('some string', 1), 
        'gen2' => array('some string', 2), 
        'gen3' => array('some string', 3), 
        'gen4' => array('some string', 4), 
        'gen5' => array('some string', 5), 
    );

    private $otherVar;

    function __construct() {
         $this->otherVar = $this->tags['gen1'][0];
    }

    function getOtherVar() {
        return $this->otherVar;
    }
}

$sc = new SomeClass();
echo $s->getOtherVar(); // echoes some string

answered Oct 6, 2016 at 1:50

Rax Weber

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