The example below has a syntax error because of the following code:
"another_key" => [ 2 => self::$someStr ] Using something such as:
"another_key" => [ 2 => "bar" ] Is correct syntax. Is there any way to access $someStr instead of hard coding the string?
<?php class Foo { protected static $someStr = 'bar'; private static $arr = [ "some_key" => [ 1 ], "another_key" => [ 2 => self::$someStr ] ]; } You cannot access static variables inside of the declaration of other static variables. You can either declare a class constant or initialize it by accessing via a function. A class constant would look like this:
class Foo { const someStr = 'bar'; private static $arr = [ "some_key" => [ 1 ], "another_key" => [ 2 => self::someStr ] ]; } Or using a function:
class Foo { private static $someStr = 'bar'; private static $arr = [ "some_key" => [ 1 ], "another_key" => [ 2 => null ] ]; private static function setKey(){ self::$arr['another_key'] = [2 => self::$somStr]; } } You'd then have to call Foo::setKey() at some point before accessing the variable.
If you want to access a property to set the value of another property you should be doing it in the class' constructor. Something like this:
class Foo { protected static $someStr = 'bar'; private static $arr = [ 'some_key' => [1] ]; public function __constructor() { self::arr['another_key'] = [2 => self::$somStr]; } } For this to work you will need to instantiate your class.
You can view some examples on property declarations in the PHP documentation.
[Property] declaration may include an initialization, but this initialization must be a constant value -- that is, it must be able to be evaluated at compile time and must not depend on run-time information in order to be evaluated.Usingself::$someStrrequires run-time evaluation