Feature Wish for PHP 6 – Class Variable Assignments with Concatenation-Support and Support for referencing Constants and Variables
<?php
/**
* A Feature Wish for PHP 6
* ------------------------
* Class variable assignments with
* concatenation support and support
* for referencing constants and variables.
*
* Basically it's a modification to PHPs reference handling.
*
* Implications:
* - a globally defined constant is assignable to a variable
* - a globally defined constant is concat-able and assignable to a variable
* - a scoped defined constant is assignable to a variable
* - a scoped defined constant is concat-able and assignable to a variable
* - a globally defined closure variable is assignable to a class-scope variable
* - a globally defined closure variable is concat-able and assignable to a class-scope variable
*/
// example "assign with self defined constant concat"
define('CONSTANT', 'My ');
class A {
public $variable = CONSTANT . 'String';
}
echo A->variable;
// Result
// Parse error: syntax error, unexpected '.', expecting ',' or ';' in helloWorld.php on line 5
// example "assign (php env) constant concat"
class B {
public $variable = DIRECTORY_SEPARATOR . 'String';
// use case: public $file = dirname(__DIR__) . 'filename.ini';
}
echo B->variable;
// Result
// Parse error: syntax error, unexpected '.', expecting ',' or ';' in helloWorld.php on line 13
// example "assign array value concat"
$array = ['A' => 'ABC', 'B' => 'BBC', 'C' => 'CBC'];
class C {
global $array;
public $variable = $array['A'] . 'String';
}
echo C->variable;
// Result
// Parse error: syntax error, unexpected '$array' (T_VARIABLE) in helloWorld.php on line 22
// example "assign with closure concat"
$closure = function() {
return 'My ';
}
class D {
public $variable = $closure . 'String';
}
echo D->variable;
// Result
// Parse error: syntax error, unexpected 'class' (T_CLASS) in helloWorld.php on line 32
