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<?php class A { private $a; public function __construct($a) { $this->a = $a; } } class B extends A { /** * Use php's magic method to enforce immutability */ public function __set($property, $value) { throw new RuntimeException(self::class . ' is immutable'); } } $a = new A(1); $b = new B(2); $a->b = $b; var_dump($a); try { $b->c = 3; } catch (RuntimeException $re) { var_dump($b); }
Output for 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
Deprecated: Creation of dynamic property A::$b is deprecated in /in/RC1Sk on line 27 object(A)#1 (2) { ["a":"A":private]=> int(1) ["b"]=> object(B)#2 (1) { ["a":"A":private]=> int(2) } } object(B)#2 (1) { ["a":"A":private]=> int(2) }
Output for 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33
object(A)#1 (2) { ["a":"A":private]=> int(1) ["b"]=> object(B)#2 (1) { ["a":"A":private]=> int(2) } } object(B)#2 (1) { ["a":"A":private]=> int(2) }
Output for 5.4.0 - 5.4.45
Parse error: syntax error, unexpected 'class' (T_CLASS), expecting identifier (T_STRING) or variable (T_VARIABLE) or '{' or '$' in /in/RC1Sk on line 20
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 T_CLASS, expecting T_STRING or T_VARIABLE or '$' in /in/RC1Sk on line 20
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_CLASS, expecting T_STRING or T_VARIABLE or '$' in /in/RC1Sk on line 20
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/RC1Sk on line 5
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_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/RC1Sk on line 5
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/RC1Sk on line 5
Process exited with code 255.
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