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@ 2016-01-13T05:26:35Z

<?php

trait Immutable
{
    private $_defaultValues = [];
    private $_userDefinedValues = [];
    private $_userDefinedProperties = [];
    private static $_doNotTakeOverProperties = [
        '_defaultValues' => true,
        '_userDefinedValues' => true,
        '_userDefinedProperties' => true,
    ];
    final public function __construct()
    {
        var_dump("in trait constructor");
        // take over all user-defined non-static properties
        foreach ((new \ReflectionObject($this))->getProperties() as $property) {
            $propertyName = $property->getName();
            if (isset(self::$_doNotTakeOverProperties[$propertyName]) || $property->isStatic()) {
                continue;
            }
            $this->_userDefinedProperties[$propertyName] = true;
            $this->_defaultValues[$propertyName] = $property->getValue($this);
            unset($this->{$property->getName()});
        }
    }
    final public function __set($name, $value)
    {
        if (!isset($this->_userDefinedProperties[$name])) {
            throw new \LogicException('Unknown property "' . $name . '"');
        }
        if (array_key_exists($name, $this->_userDefinedValues)) {
            throw new \LogicException('You can not overwrite the value for property "' . $name . '"');
        }
        $this->_userDefinedValues[$name] = $value;
    }
    final public function __get($name)
    {
        if (!isset($this->_userDefinedProperties[$name])) {
            throw new \LogicException('Unknown property "' . $name . '"');
        }
        if (array_key_exists($name, $this->_userDefinedValues)) {
            return $this->_userDefinedValues[$name];
        }
        return $this->_defaultValues[$name];
    }
}

class Foo {
    use Immutable;
    
    public $poo;
    
    public function __construct()
    {
        var_dump("in class constructor");
        parent::__construct();
    }
}

$foo = new Foo;
$foo->poo = 1;
$foo->poo = 2;

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: Cannot use "parent" when current class scope has no parent in /in/o5Aeq on line 57
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: Cannot use "parent" when current class scope has no parent in /in/o5Aeq on line 57
Process exited with code 255.
Output for 7.4.0 - 7.4.33: Deprecated: Cannot use "parent" when current class scope has no parent in /in/o5Aeq on line 57 string(20) "in class constructor" Fatal error: Uncaught Error: Cannot access parent:: when current class scope has no parent in /in/o5Aeq:57 Stack trace: #0 /in/o5Aeq(61): Foo->__construct() #1 {main} thrown in /in/o5Aeq on line 57
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33: string(20) "in class constructor" Fatal error: Uncaught Error: Cannot access parent:: when current class scope has no parent in /in/o5Aeq:57 Stack trace: #0 /in/o5Aeq(61): Foo->__construct() #1 {main} thrown in /in/o5Aeq on line 57
Process exited with code 255.
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28: string(20) "in class constructor" Fatal error: Cannot access parent:: when current class scope has no parent in /in/o5Aeq on line 57
Process exited with code 255.

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