Online PHP editor | output for e7mAH

@ 2020-01-25T17:34:51Z

<?php
class User 
{
    const HARDCODED_NAME = 'Васян';
    
    public $fullName = [
        'surname'    => 'Иванов', 
        'name'       => 'Иван', 
        'patronymic' => 'Иванович',
    ];
}

$property = 'fullName';
$user = new User;
echo $user->$property['surname'] . PHP_EOL; // Выведет "Иванов"

class Child extends User 
{
    public $parent;
    
    public $fullName = [
        'surname'    => 'Петров', 
        'name'       => 'Петр', 
        'patronymic' => 'Петрович',
    ];
    
    public function __construct(User $parent)
    {
        $this->parent = $parent;
    }
}

$parentProperty = 'parent';
$child          = new Child(new User);

echo $user->$property['surname'] . PHP_EOL; // Выведет "Петров"
echo $child->$parentProperty::HARDCODED_NAME . PHP_EOL; // Выведет "Васян"

$arrayProperty = ['parent'];
echo $child->{$arrayProperty[0]}::HARDCODED_NAME . PHP_EOL; // Выведет "Васян"

Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12: Иванов Иванов Васян Васян
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40: Parse error: syntax error, unexpected '::' (T_PAAMAYIM_NEKUDOTAYIM), expecting ',' or ';' in /in/e7mAH on line 37
Process exited with code 255.
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29: Parse error: syntax error, unexpected '[' in /in/e7mAH on line 6
Process exited with code 255.
Output for 5.0.0 - 5.0.5: Parse error: parse error, unexpected '[' in /in/e7mAH on line 6
Process exited with code 255.
Output for 4.4.2 - 4.4.9: Parse error: syntax error, unexpected T_CONST, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/e7mAH on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1: Parse error: parse error, unexpected T_CONST, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/e7mAH on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/e7mAH on line 4
Process exited with code 255.

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