Online PHP editor | output for 2GMh8

@ 2019-10-17T14:19:38Z

<?php

// If the symbol tables were merged, all these would become theoretically possible:

function f(callable $f) { }

function FuncName() { }

class ClassName
{
    public $PropName;
    function MethodName() {}
}

f(FuncName); // currently looks for a constant

f(ClassName::MethodName); // currently looks for a class constant

$o = new ClassName;
f($o->MethodName); // currently looks for a property

$o->PropName = function() {};
$o->PropName(); // currently tries to invoke a method


// ================================


// Additionally, the ability to pass func/method ptrs around as first-class symbols would allow such references to
// implicitly be bound to the scope where the reference was defined, eliminating this problem

class Scope
{
    public $callbacks = [];

    public function registerCallback(callable $f) { $this->callbacks[] = $f; }

    private function inner() {}

    public function __construct()
    {
        // works, inner() is accessible from this scope so the `callable` constraint is satisfied
        $this->registerCallback([$this, 'inner']);
    }
}

$o = new Scope();
($o->callbacks[0])(); // scope error, despite the theoretically type-safe way that the callback was added

Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6: Fatal error: Uncaught Error: Undefined constant "FuncName" in /in/2GMh8:15 Stack trace: #0 {main} thrown in /in/2GMh8 on line 15
Process exited with code 255.
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 Fatal error: Uncaught Error: Undefined constant "FuncName" in /in/2GMh8:15 Stack trace: #0 {main} thrown in /in/2GMh8 on line 15
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33: Warning: Use of undefined constant FuncName - assumed 'FuncName' (this will throw an Error in a future version of PHP) in /in/2GMh8 on line 15 Fatal error: Uncaught Error: Undefined class constant 'MethodName' in /in/2GMh8:17 Stack trace: #0 {main} thrown in /in/2GMh8 on line 17
Process exited with code 255.
Output for 7.1.25 - 7.1.33: Notice: Use of undefined constant FuncName - assumed 'FuncName' in /in/2GMh8 on line 15 Fatal error: Uncaught Error: Undefined class constant 'MethodName' in /in/2GMh8:17 Stack trace: #0 {main} thrown in /in/2GMh8 on line 17
Process exited with code 255.

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