php concatenating string to classconstant in array assignment

following doesn't work:

class test{
    const t = 10;
    public static $y = array('t' => self::t . 'hello');

can somebody tell me why that is? :)

it fails in the ... => self::t . 'hello')... part, where it, as seams, not is able to concatenate a classconstant in the array().

that implies that both of following works perfect:

public static $y = array('t' => self::t);


public static $y = array('t' => 'hello');


can somebody tell me why that is?

Concatenation is a product of run-time. Class member initial values must be known at parse time.

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