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<?php class A { } class B extends A { public parent $instOfParent; # equivalent to "public A $instOfParent" } class C extends B { } class Beta extends A { } $b = new B(); $b->instOfParent = new A(); # A is B's parent var_dump($b); $b->instOfParent = new A(); # B is a sub-class of A var_dump($b); $b->instOfParent = new C(); # C is a sub-sub-class of A var_dump($b); $b->instOfParent = new Beta(); # Beta is a sub-class of A (but not of B) var_dump($b);
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
object(B)#1 (1) { ["instOfParent"]=> object(A)#2 (0) { } } object(B)#1 (1) { ["instOfParent"]=> object(A)#3 (0) { } } object(B)#1 (1) { ["instOfParent"]=> object(C)#2 (0) { ["instOfParent"]=> uninitialized(parent) } } object(B)#1 (1) { ["instOfParent"]=> object(Beta)#3 (0) { } }
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 object(B)#1 (1) { ["instOfParent"]=> object(A)#2 (0) { } } object(B)#1 (1) { ["instOfParent"]=> object(A)#3 (0) { } } object(B)#1 (1) { ["instOfParent"]=> object(C)#2 (0) { ["instOfParent"]=> uninitialized(parent) } } object(B)#1 (1) { ["instOfParent"]=> object(Beta)#3 (0) { } }
Output for 7.4.0 - 7.4.33, 8.0.0 - 8.0.30
object(B)#1 (1) { ["instOfParent"]=> object(A)#2 (0) { } } object(B)#1 (1) { ["instOfParent"]=> object(A)#3 (0) { } } object(B)#1 (1) { ["instOfParent"]=> object(C)#2 (0) { ["instOfParent"]=> uninitialized(A) } } object(B)#1 (1) { ["instOfParent"]=> object(Beta)#3 (0) { } }
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33
Parse error: syntax error, unexpected 'parent' (T_STRING), expecting function (T_FUNCTION) or const (T_CONST) in /in/2qeIS on line 6
Process exited with code 255.

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