Online PHP editor | output for CFRbg

@ 2018-06-01T18:49:52Z

<?php

namespace {
    try {
    $parent = new Package\MyParent();
    $parent->test();
    } catch (\Throwable $e) {
        var_dump($e);
    }
    try {
        $pubChild = new Package\MyParent\PublicChild();//create new public child (possible)
    } catch (\Throwable $e) {
        var_dump($e);
    }
    try {
        $protChild = new Package\MyParent\ProtectedChild(); //create new protected child (ERROR)
    } catch (\Throwable $e) {
        var_dump($e);
    }

    class Package
    {

        /* protect constructor so that objects can't be instantiated from outside
         * Since all classes inherit from Package class, they can instantiate eachother
         * simulating protected InnerClasses
         */
        protected function __construct()
        {
        }

        /* This magic method is called everytime an inaccessible method is called
         * (either by visibility contrains or it doesn't exist)
         * Here we are simulating shared protected methods across "package" classes
         * This method is inherited by all child classes of Package
         */
        public function __call($method, $args)
        {

            //class name
            $class = get_class($this);

            /* we check if a method exists, if not we throw an exception
             * similar to the default error
             */
            if (method_exists($this, $method)) {

                /* The method exists so now we want to know if the
                 * caller is a child of our Package class. If not we throw an exception
                 * Note: This is a kind of a dirty way of finding out who's
                 * calling the method by using debug_backtrace and reflection
                 */
                $trace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 3);
                if (isset($trace[2])) {
                    $ref = new ReflectionClass($trace[2]['class']);
                    if ($ref->isSubclassOf(__CLASS__)) {
                        return $this->$method($args);
                    }
                }
                throw new RuntimeException("Call to private method $class::$method()");
            } else {
                throw new RuntimeException("Call to undefined method $class::$method()");
            }
        }
    }
}

namespace Package {

    class MyParent extends \Package
    {
        public $publicChild;
        protected $protectedChild;

        public function __construct()
        {
            //instantiate public child inside parent
            $this->publicChild = new \Package\MyParent\PublicChild();
            //instantiate protected child inside parent
            $this->protectedChild = new \Package\MyParent\ProtectedChild();
        }

        public function test(): void
        {
            echo "Call from parent -> ";
            $this->publicChild->protectedMethod();
            $this->protectedChild->protectedMethod();

            echo "<br>Siblings<br>";
            $this->publicChild->callSibling($this->protectedChild);
        }
    }
}

namespace Package\MyParent {

    class PublicChild extends \Package
    {
        //Makes the constructor public, hence callable from outside
        public function __construct()
        {
        }

        protected function protectedMethod(): void
        {
            echo "I'm " . get_class($this) . " protected method<br>";
        }

        protected function callSibling($sibling): void
        {
            echo "Call from " . get_class($this) . " -> ";
            $sibling->protectedMethod();
        }
    }

    class ProtectedChild extends \Package
    {
        protected function protectedMethod(): void
        {
            echo "I'm " . get_class($this) . " protected method<br>";
        }

        protected function callSibling($sibling): void
        {
            echo "Call from " . get_class($this) . " -> ";
            $sibling->protectedMethod();
        }
    }
}

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: Call from parent -> object(RuntimeException)#4 (7) { ["message":protected]=> string(70) "Call to private method Package\MyParent\PublicChild::protectedMethod()" ["string":"Exception":private]=> string(0) "" ["code":protected]=> int(0) ["file":protected]=> string(9) "/in/CFRbg" ["line":protected]=> int(60) ["trace":"Exception":private]=> array(2) { [0]=> array(6) { ["file"]=> string(9) "/in/CFRbg" ["line"]=> int(86) ["function"]=> string(6) "__call" ["class"]=> string(7) "Package" ["type"]=> string(2) "->" ["args"]=> array(2) { [0]=> string(15) "protectedMethod" [1]=> array(0) { } } } [1]=> array(6) { ["file"]=> string(9) "/in/CFRbg" ["line"]=> int(6) ["function"]=> string(4) "test" ["class"]=> string(16) "Package\MyParent" ["type"]=> string(2) "->" ["args"]=> array(0) { } } } ["previous":"Exception":private]=> NULL } object(Error)#7 (7) { ["message":protected]=> string(58) "Call to protected Package::__construct() from global scope" ["string":"Error":private]=> string(0) "" ["code":protected]=> int(0) ["file":protected]=> string(9) "/in/CFRbg" ["line":protected]=> int(16) ["trace":"Error":private]=> array(0) { } ["previous":"Error":private]=> NULL }
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 Call from parent -> object(RuntimeException)#4 (7) { ["message":protected]=> string(70) "Call to private method Package\MyParent\PublicChild::protectedMethod()" ["string":"Exception":private]=> string(0) "" ["code":protected]=> int(0) ["file":protected]=> string(9) "/in/CFRbg" ["line":protected]=> int(60) ["trace":"Exception":private]=> array(2) { [0]=> array(6) { ["file"]=> string(9) "/in/CFRbg" ["line"]=> int(86) ["function"]=> string(6) "__call" ["class"]=> string(7) "Package" ["type"]=> string(2) "->" ["args"]=> array(2) { [0]=> string(15) "protectedMethod" [1]=> array(0) { } } } [1]=> array(6) { ["file"]=> string(9) "/in/CFRbg" ["line"]=> int(6) ["function"]=> string(4) "test" ["class"]=> string(16) "Package\MyParent" ["type"]=> string(2) "->" ["args"]=> array(0) { } } } ["previous":"Exception":private]=> NULL } object(Error)#7 (7) { ["message":protected]=> string(58) "Call to protected Package::__construct() from global scope" ["string":"Error":private]=> string(0) "" ["code":protected]=> int(0) ["file":protected]=> string(9) "/in/CFRbg" ["line":protected]=> int(16) ["trace":"Error":private]=> array(0) { } ["previous":"Error":private]=> NULL }
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33: Call from parent -> object(RuntimeException)#4 (7) { ["message":protected]=> string(70) "Call to private method Package\MyParent\PublicChild::protectedMethod()" ["string":"Exception":private]=> string(0) "" ["code":protected]=> int(0) ["file":protected]=> string(9) "/in/CFRbg" ["line":protected]=> int(60) ["trace":"Exception":private]=> array(2) { [0]=> array(6) { ["file"]=> string(9) "/in/CFRbg" ["line"]=> int(86) ["function"]=> string(6) "__call" ["class"]=> string(7) "Package" ["type"]=> string(2) "->" ["args"]=> array(2) { [0]=> string(15) "protectedMethod" [1]=> array(0) { } } } [1]=> array(6) { ["file"]=> string(9) "/in/CFRbg" ["line"]=> int(6) ["function"]=> string(4) "test" ["class"]=> string(16) "Package\MyParent" ["type"]=> string(2) "->" ["args"]=> array(0) { } } } ["previous":"Exception":private]=> NULL } object(Error)#7 (7) { ["message":protected]=> string(61) "Call to protected Package::__construct() from invalid context" ["string":"Error":private]=> string(0) "" ["code":protected]=> int(0) ["file":protected]=> string(9) "/in/CFRbg" ["line":protected]=> int(16) ["trace":"Error":private]=> array(0) { } ["previous":"Error":private]=> NULL }

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